From 6a32c810703f4ec0c39fe18298ebe6c40acac8f1 Mon Sep 17 00:00:00 2001
From: Delyan Angelov <delian66@gmail.com>
Date: Mon, 9 Jan 2023 23:47:03 +0200
Subject: [PATCH] tests: extract slow tests (prod, valgrind, inout, repl etc),
 from vlib/v/tests/ to vlib/v/slow_tests/ (#16892)

---
 TESTS.md                                      |  6 +-
 cmd/tools/vtest-cleancode.v                   |  6 +-
 cmd/tools/vtest-self.v                        | 14 ++---
 cmd/tools/vvet/vvet.v                         |  2 +-
 vlib/.vdocignore                              |  1 +
 vlib/net/address.v                            | 23 +++++--
 vlib/net/http/header_test.v                   | 60 +++++++++----------
 vlib/net/tcp_test.v                           | 14 ++---
 vlib/net/urllib/urllib_test.v                 | 14 ++---
 .../assembly/asm_test.amd64.v                 |  2 +-
 .../assembly/asm_test.i386.v                  |  0
 .../assembly/naked_attr_test.amd64.v          |  0
 .../assembly/naked_attr_test.i386.v           |  0
 .../assembly/util/dot_amd64_util.amd64.v      |  0
 .../comptime_if_expr_threads_test.v           |  0
 .../crun_mode/crun_test.v                     |  0
 vlib/v/{tests => slow_tests}/inout/.gitignore |  0
 .../{tests => slow_tests}/inout/bad_st_as.out |  0
 vlib/v/slow_tests/inout/bad_st_as.vv          | 20 +++++++
 .../inout/cli_command_no_execute.out          |  0
 .../inout/cli_command_no_execute.vv           |  2 +-
 .../inout/cli_root_default_help.out           |  0
 .../inout/cli_root_default_help.vv            |  4 +-
 .../inout/closure_with_fn_variables.out       |  0
 .../inout/closure_with_fn_variables.vv        |  0
 .../inout/closure_with_nested_closure_var.out |  0
 .../inout/closure_with_nested_closure_var.vv  |  4 +-
 .../inout/compiler_test.v                     |  2 +-
 .../inout/comptime_bool_fields.out            |  0
 .../inout/comptime_bool_fields.vv             |  0
 .../inout/comptime_if_script_mode.out         |  0
 .../inout/comptime_if_script_mode.vv          |  5 ++
 .../inout/data_obj.v.templ                    |  0
 vlib/v/slow_tests/inout/dump_expression.out   | 32 ++++++++++
 .../inout/dump_expression.vv                  |  6 +-
 .../inout/dump_generic_fn_mut_arg.out         |  1 +
 .../inout/dump_generic_fn_mut_arg.vv          |  0
 .../inout/dump_generic_interface_ref_arg.out  |  6 ++
 .../inout/dump_generic_interface_ref_arg.vv   |  0
 vlib/v/slow_tests/inout/dump_match_expr.out   |  1 +
 .../inout/dump_match_expr.vv                  |  0
 vlib/v/slow_tests/inout/dump_multiple_ptr.out |  4 ++
 .../inout/dump_multiple_ptr.vv                |  0
 .../dump_nested_generic_fn_call_ref_arg.out   | 23 +++++++
 .../dump_nested_generic_fn_call_ref_arg.vv    |  8 +--
 vlib/v/slow_tests/inout/dump_nil_voidptr.out  |  2 +
 .../inout/dump_nil_voidptr.vv                 |  2 +-
 vlib/v/slow_tests/inout/dump_none.out         |  1 +
 .../{tests => slow_tests}/inout/dump_none.vv  |  0
 vlib/v/slow_tests/inout/dump_shared_arg.out   |  3 +
 .../inout/dump_shared_arg.vv                  |  0
 .../inout/dump_sumtype_of_fntype.out          |  1 +
 .../inout/dump_sumtype_of_fntype.vv           |  0
 .../{tests => slow_tests}/inout/embedded.html |  0
 .../inout/enum_print.out                      |  0
 .../{tests => slow_tests}/inout/enum_print.vv |  4 +-
 vlib/v/{tests => slow_tests}/inout/file.html  |  0
 vlib/v/{tests => slow_tests}/inout/file.md    |  0
 .../inout/fixed_array_index.out               |  0
 .../inout/fixed_array_index.vv                |  2 +-
 .../inout/fixed_array_slice.out               |  0
 .../inout/fixed_array_slice.vv                |  2 +-
 vlib/v/{tests => slow_tests}/inout/footer.md  |  0
 .../inout/generic_fn_with_array_arg.out       |  0
 .../inout/generic_fn_with_array_arg.vv        |  0
 .../{tests => slow_tests}/inout/go_print.out  |  0
 .../v/{tests => slow_tests}/inout/go_print.vv |  4 +-
 vlib/v/{tests => slow_tests}/inout/header.md  |  0
 vlib/v/{tests => slow_tests}/inout/hello.out  |  0
 vlib/v/{tests => slow_tests}/inout/hello.vv   |  0
 .../inout/hello_devs.out                      |  0
 vlib/v/slow_tests/inout/hello_devs.vv         |  7 +++
 .../inout/nested_generic_fn_call.out          |  0
 .../inout/nested_generic_fn_call.vv           |  0
 .../inout/nested_structs.out                  |  0
 .../inout/nested_structs.vv                   |  2 +-
 .../inout/option_fn_arg.out                   |  0
 .../inout/option_fn_arg.vv                    |  0
 vlib/v/{tests => slow_tests}/inout/os.out     |  0
 vlib/v/{tests => slow_tests}/inout/os.vv      |  0
 .../inout/panic_with_cg.out                   |  2 +-
 .../inout/panic_with_cg.vv                    |  5 +-
 .../inout/printing_alias_has_str_method.out   |  0
 .../inout/printing_alias_has_str_method.vv    |  2 +-
 .../printing_aliases_of_multi_fixed_array.out |  0
 .../printing_aliases_of_multi_fixed_array.vv  |  0
 .../printing_complex_if_exprs_output.out      |  0
 .../inout/printing_complex_if_exprs_output.vv |  0
 .../inout/printing_comptime_if.out            |  0
 .../inout/printing_comptime_if.vv             |  2 +-
 .../printing_fixed_array_of_pointers.out      |  0
 .../inout/printing_fixed_array_of_pointers.vv |  0
 .../inout/printing_for_v_in_a.out             |  0
 .../inout/printing_for_v_in_a.vv              |  2 +-
 .../inout/printing_multi_fixed_array.out      |  0
 .../inout/printing_multi_fixed_array.vv       |  0
 .../inout/printing_nested_generic_struct.out  |  0
 .../inout/printing_nested_generic_struct.vv   |  0
 .../inout/printing_option_in_if_expr.out      |  0
 .../inout/printing_option_in_if_expr.vv       |  0
 .../inout/printing_reference_alias.out        |  0
 .../inout/printing_reference_alias.vv         |  0
 .../inout/printing_reference_enum.out         |  0
 .../inout/printing_reference_enum.vv          |  0
 .../inout/printing_reference_struct.out       |  0
 .../inout/printing_reference_struct.vv        |  2 +-
 .../inout/printing_result_in_infix_expr.out   |  0
 .../inout/printing_result_in_infix_expr.vv    |  0
 .../inout/printing_result_in_infix_expr2.out  |  0
 .../inout/printing_result_in_infix_expr2.vv   |  0
 ...printing_slice_of_multiline_raw_string.out |  0
 .../printing_slice_of_multiline_raw_string.vv |  0
 .../printing_struct_with_skip_fields.out      |  0
 .../inout/printing_struct_with_skip_fields.vv |  0
 .../inout/printing_sumtype_with_none.out      |  0
 .../inout/printing_sumtype_with_none.vv       |  0
 .../inout/push_on_closed_channel.out          |  0
 .../inout/push_on_closed_channel.vv           |  0
 .../inout/push_work_on_channel.out            |  0
 .../inout/push_work_on_channel.vv             |  4 +-
 .../inout/smart_quote.out                     |  0
 .../inout/smart_quote.vv                      |  0
 .../inout/strconv_v_printf.out                |  0
 .../inout/strconv_v_printf.vv                 |  2 +-
 .../inout/string_interp.out                   |  0
 .../inout/string_interp.vv                    |  2 +-
 .../slow_tests/inout/struct_field_option.out  | 26 ++++++++
 .../inout/struct_field_option.vv              |  0
 .../inout/sumtype_with_fntype.out             |  0
 .../inout/sumtype_with_fntype.vv              |  0
 .../inout/tmpl_all_in_one_folder.out          |  0
 .../inout/tmpl_all_in_one_folder.vv           |  0
 .../inout/tmpl_expand_v_source_code.out       |  0
 .../inout/tmpl_expand_v_source_code.vv        | 17 ++++++
 .../inout/tmpl_parse_html.out                 |  0
 .../inout/tmpl_parse_html.vv                  |  0
 .../inout/vscript_using_generics_in_os.out    |  0
 .../inout/vscript_using_generics_in_os.vsh    |  0
 .../keep_args_alive_test.v                    |  2 +-
 .../keep_args_alive_test_c.h                  |  0
 .../modules/acommentedmodule/commentedfile.v  |  0
 vlib/v/{tests => slow_tests}/prod/.gitignore  |  0
 .../prod/asserts_should_be_skipped.prod.v     |  0
 ...erts_should_be_skipped.prod.v.expected.txt |  0
 .../v/{tests => slow_tests}/prod/assoc.prod.v |  0
 .../prod/assoc.prod.v.expected.txt            |  0
 ...expressions_should_not_round_as_f32.prod.v |  0
 ...hould_not_round_as_f32.prod.v.expected.txt |  0
 vlib/v/{tests => slow_tests}/prod_test.v      |  2 +-
 .../profile/profile_test.v                    |  6 +-
 .../profile/profile_test_1.v                  |  0
 .../profile/profile_test_2.v                  |  0
 .../profile/profile_test_3.v                  |  0
 .../{tests => slow_tests}/repl/.gitattributes |  0
 vlib/v/{tests => slow_tests}/repl/.gitignore  |  0
 vlib/v/{tests => slow_tests}/repl/README.md   |  0
 .../repl/array_filter.repl                    |  0
 .../repl/array_init.repl                      |  0
 .../repl/array_method.repl                    |  0
 .../repl/bad_in_type.repl.skip                |  0
 .../repl/chained_fields/bd.repl.skip          |  0
 .../repl/chained_fields/c.repl.skip           |  0
 .../repl/chained_fields/c2.repl.skip          |  0
 .../repl/chained_fields/d.repl.skip           |  0
 .../repl/chained_fields/ef.repl.skip          |  0
 .../repl/comptime_tmpl.repl                   |  0
 .../repl/conditional_blocks/for.repl          |  0
 .../repl/conditional_blocks/if.repl           |  0
 .../repl/conditional_blocks/if_else.repl      |  0
 .../repl/default_printing.repl                |  0
 .../repl/empty_struct.repl.skip               |  0
 .../repl/entire_commented_module.repl         |  7 +++
 vlib/v/{tests => slow_tests}/repl/error.repl  |  0
 .../repl/error_and_continue_print.repl        |  0
 .../repl/error_exitasdfasdf.repl              |  0
 .../repl/error_nosave.repl.skip               |  0
 .../{tests => slow_tests}/repl/fn_calls.repl  |  0
 .../repl/function.repl.skip                   |  0
 .../immutable_len_fields/fields.1.repl.skip   |  0
 .../immutable_len_fields/fields.2.repl.skip   |  0
 .../immutable_len_fields/fields.3.repl.skip   |  0
 vlib/v/{tests => slow_tests}/repl/import.repl |  0
 .../repl/import_alias.repl                    |  0
 .../repl/naked_strings.repl                   |  0
 .../{tests => slow_tests}/repl/newlines.repl  |  0
 vlib/v/{tests => slow_tests}/repl/nomain.repl |  0
 .../v/{tests => slow_tests}/repl/nothing.repl |  0
 .../repl/open_close_string_check.repl         |  0
 .../repl/option.repl.skip                     |  0
 .../repl/option_call.repl                     |  0
 .../repl/postfix_operators.repl               |  0
 .../repl/print_and_fn_call.repl               |  0
 .../v/{tests => slow_tests}/repl/println.repl |  0
 vlib/v/{tests => slow_tests}/repl/repl_test.v |  8 +--
 .../repl/runner/runner.v                      |  2 +-
 .../{tests => slow_tests}/repl/tmpl/hello.txt |  0
 .../{tests => slow_tests}/repl/var_decl.repl  |  0
 .../repl/void_vlib_fncall.repl                |  0
 .../f1.v                                      |  0
 .../f2.v                                      |  0
 .../main.v                                    |  0
 .../a.v                                       |  0
 .../b.v                                       |  0
 .../any_test.v                                |  0
 .../main.v                                    |  0
 .../run_project_folders_test.v                |  4 +-
 .../valgrind/1.strings_and_arrays.v           |  0
 .../valgrind/2.heap_objects.v                 |  0
 .../array_init_with_string_variable.v         |  0
 .../v/{tests => slow_tests}/valgrind/base64.v |  0
 .../buffer_passed_in_fn_that_uses_tos_on_it.v |  0
 .../valgrind/dump_nested_structs.v            |  0
 .../valgrind/fn_returning_string_param.v      |  0
 .../fn_with_return_should_free_local_vars.v   |  0
 .../valgrind/free_heap_foos.v                 |  0
 ...e_variables_in_reverse_order_of_creation.v |  0
 .../{tests => slow_tests}/valgrind/if_expr.v  |  0
 .../valgrind/if_expr_skip.v                   |  0
 .../import_os_and_use_its_constants.v         |  0
 .../valgrind/import_x_json2.v                 |  0
 .../{tests => slow_tests}/valgrind/logging.v  |  0
 .../valgrind/option_reassigned.v              |  0
 .../valgrind/option_simple.v                  |  0
 .../valgrind/rand_module.v                    |  0
 .../valgrind/rune_methods.v                   |  0
 .../valgrind/simple_interpolation.v           |  0
 .../simple_interpolation_script_mode.v        |  0
 ...le_interpolation_script_mode_more_scopes.v |  0
 .../valgrind/string_plus_string_plus.v        |  0
 .../valgrind/string_str_method.v              |  0
 .../valgrind/strings_builder.v                |  0
 .../valgrind/struct_field.v                   |  0
 .../valgrind/struct_of_array_of_same_struct.v |  0
 .../valgrind/valgrind_test.v                  | 22 +++----
 vlib/v/tests/inout/bad_st_as.vv               | 13 ----
 vlib/v/tests/inout/comptime_if_script_mode.vv |  5 --
 vlib/v/tests/inout/dump_expression.out        | 32 ----------
 .../v/tests/inout/dump_generic_fn_mut_arg.out |  1 -
 .../inout/dump_generic_interface_ref_arg.out  |  6 --
 vlib/v/tests/inout/dump_match_expr.out        |  1 -
 vlib/v/tests/inout/dump_multiple_ptr.out      |  4 --
 .../dump_nested_generic_fn_call_ref_arg.out   | 23 -------
 vlib/v/tests/inout/dump_nil_voidptr.out       |  2 -
 vlib/v/tests/inout/dump_none.out              |  1 -
 vlib/v/tests/inout/dump_shared_arg.out        |  3 -
 vlib/v/tests/inout/dump_sumtype_of_fntype.out |  1 -
 vlib/v/tests/inout/hello_devs.vv              |  7 ---
 vlib/v/tests/inout/struct_field_option.out    | 26 --------
 .../tests/inout/tmpl_expand_v_source_code.vv  | 18 ------
 vlib/v/tests/known_errors/known_errors_test.v |  2 +-
 .../v/tests/repl/entire_commented_module.repl |  7 ---
 251 files changed, 291 insertions(+), 270 deletions(-)
 rename vlib/v/{tests => slow_tests}/assembly/asm_test.amd64.v (99%)
 rename vlib/v/{tests => slow_tests}/assembly/asm_test.i386.v (100%)
 rename vlib/v/{tests => slow_tests}/assembly/naked_attr_test.amd64.v (100%)
 rename vlib/v/{tests => slow_tests}/assembly/naked_attr_test.i386.v (100%)
 rename vlib/v/{tests => slow_tests}/assembly/util/dot_amd64_util.amd64.v (100%)
 rename vlib/v/{tests => slow_tests}/comptime_if_expr_threads_test.v (100%)
 rename vlib/v/{tests => slow_tests}/crun_mode/crun_test.v (100%)
 rename vlib/v/{tests => slow_tests}/inout/.gitignore (100%)
 rename vlib/v/{tests => slow_tests}/inout/bad_st_as.out (100%)
 create mode 100644 vlib/v/slow_tests/inout/bad_st_as.vv
 rename vlib/v/{tests => slow_tests}/inout/cli_command_no_execute.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/cli_command_no_execute.vv (83%)
 rename vlib/v/{tests => slow_tests}/inout/cli_root_default_help.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/cli_root_default_help.vv (60%)
 rename vlib/v/{tests => slow_tests}/inout/closure_with_fn_variables.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/closure_with_fn_variables.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/closure_with_nested_closure_var.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/closure_with_nested_closure_var.vv (80%)
 rename vlib/v/{tests => slow_tests}/inout/compiler_test.v (98%)
 rename vlib/v/{tests => slow_tests}/inout/comptime_bool_fields.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/comptime_bool_fields.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/comptime_if_script_mode.out (100%)
 create mode 100644 vlib/v/slow_tests/inout/comptime_if_script_mode.vv
 rename vlib/v/{tests => slow_tests}/inout/data_obj.v.templ (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_expression.out
 rename vlib/v/{tests => slow_tests}/inout/dump_expression.vv (95%)
 create mode 100644 vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.out
 rename vlib/v/{tests => slow_tests}/inout/dump_generic_fn_mut_arg.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.out
 rename vlib/v/{tests => slow_tests}/inout/dump_generic_interface_ref_arg.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_match_expr.out
 rename vlib/v/{tests => slow_tests}/inout/dump_match_expr.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_multiple_ptr.out
 rename vlib/v/{tests => slow_tests}/inout/dump_multiple_ptr.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.out
 rename vlib/v/{tests => slow_tests}/inout/dump_nested_generic_fn_call_ref_arg.vv (82%)
 create mode 100644 vlib/v/slow_tests/inout/dump_nil_voidptr.out
 rename vlib/v/{tests => slow_tests}/inout/dump_nil_voidptr.vv (86%)
 create mode 100644 vlib/v/slow_tests/inout/dump_none.out
 rename vlib/v/{tests => slow_tests}/inout/dump_none.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_shared_arg.out
 rename vlib/v/{tests => slow_tests}/inout/dump_shared_arg.vv (100%)
 create mode 100644 vlib/v/slow_tests/inout/dump_sumtype_of_fntype.out
 rename vlib/v/{tests => slow_tests}/inout/dump_sumtype_of_fntype.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/embedded.html (100%)
 rename vlib/v/{tests => slow_tests}/inout/enum_print.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/enum_print.vv (92%)
 rename vlib/v/{tests => slow_tests}/inout/file.html (100%)
 rename vlib/v/{tests => slow_tests}/inout/file.md (100%)
 rename vlib/v/{tests => slow_tests}/inout/fixed_array_index.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/fixed_array_index.vv (69%)
 rename vlib/v/{tests => slow_tests}/inout/fixed_array_slice.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/fixed_array_slice.vv (59%)
 rename vlib/v/{tests => slow_tests}/inout/footer.md (100%)
 rename vlib/v/{tests => slow_tests}/inout/generic_fn_with_array_arg.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/generic_fn_with_array_arg.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/go_print.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/go_print.vv (61%)
 rename vlib/v/{tests => slow_tests}/inout/header.md (100%)
 rename vlib/v/{tests => slow_tests}/inout/hello.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/hello.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/hello_devs.out (100%)
 create mode 100644 vlib/v/slow_tests/inout/hello_devs.vv
 rename vlib/v/{tests => slow_tests}/inout/nested_generic_fn_call.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/nested_generic_fn_call.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/nested_structs.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/nested_structs.vv (94%)
 rename vlib/v/{tests => slow_tests}/inout/option_fn_arg.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/option_fn_arg.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/os.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/os.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/panic_with_cg.out (66%)
 rename vlib/v/{tests => slow_tests}/inout/panic_with_cg.vv (59%)
 rename vlib/v/{tests => slow_tests}/inout/printing_alias_has_str_method.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_alias_has_str_method.vv (87%)
 rename vlib/v/{tests => slow_tests}/inout/printing_aliases_of_multi_fixed_array.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_aliases_of_multi_fixed_array.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_complex_if_exprs_output.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_complex_if_exprs_output.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_comptime_if.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_comptime_if.vv (74%)
 rename vlib/v/{tests => slow_tests}/inout/printing_fixed_array_of_pointers.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_fixed_array_of_pointers.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_for_v_in_a.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_for_v_in_a.vv (90%)
 rename vlib/v/{tests => slow_tests}/inout/printing_multi_fixed_array.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_multi_fixed_array.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_nested_generic_struct.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_nested_generic_struct.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_option_in_if_expr.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_option_in_if_expr.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_alias.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_alias.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_enum.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_enum.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_struct.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_reference_struct.vv (81%)
 rename vlib/v/{tests => slow_tests}/inout/printing_result_in_infix_expr.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_result_in_infix_expr.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_result_in_infix_expr2.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_result_in_infix_expr2.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_slice_of_multiline_raw_string.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_slice_of_multiline_raw_string.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_struct_with_skip_fields.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_struct_with_skip_fields.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_sumtype_with_none.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/printing_sumtype_with_none.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/push_on_closed_channel.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/push_on_closed_channel.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/push_work_on_channel.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/push_work_on_channel.vv (88%)
 rename vlib/v/{tests => slow_tests}/inout/smart_quote.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/smart_quote.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/strconv_v_printf.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/strconv_v_printf.vv (94%)
 rename vlib/v/{tests => slow_tests}/inout/string_interp.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/string_interp.vv (60%)
 create mode 100644 vlib/v/slow_tests/inout/struct_field_option.out
 rename vlib/v/{tests => slow_tests}/inout/struct_field_option.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/sumtype_with_fntype.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/sumtype_with_fntype.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/tmpl_all_in_one_folder.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/tmpl_all_in_one_folder.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/tmpl_expand_v_source_code.out (100%)
 create mode 100644 vlib/v/slow_tests/inout/tmpl_expand_v_source_code.vv
 rename vlib/v/{tests => slow_tests}/inout/tmpl_parse_html.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/tmpl_parse_html.vv (100%)
 rename vlib/v/{tests => slow_tests}/inout/vscript_using_generics_in_os.out (100%)
 rename vlib/v/{tests => slow_tests}/inout/vscript_using_generics_in_os.vsh (100%)
 rename vlib/v/{tests => slow_tests}/keep_args_alive_test.v (97%)
 rename vlib/v/{tests => slow_tests}/keep_args_alive_test_c.h (100%)
 rename vlib/v/{tests => slow_tests}/modules/acommentedmodule/commentedfile.v (100%)
 rename vlib/v/{tests => slow_tests}/prod/.gitignore (100%)
 rename vlib/v/{tests => slow_tests}/prod/asserts_should_be_skipped.prod.v (100%)
 rename vlib/v/{tests => slow_tests}/prod/asserts_should_be_skipped.prod.v.expected.txt (100%)
 rename vlib/v/{tests => slow_tests}/prod/assoc.prod.v (100%)
 rename vlib/v/{tests => slow_tests}/prod/assoc.prod.v.expected.txt (100%)
 rename vlib/v/{tests => slow_tests}/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v (100%)
 rename vlib/v/{tests => slow_tests}/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v.expected.txt (100%)
 rename vlib/v/{tests => slow_tests}/prod_test.v (95%)
 rename vlib/v/{tests => slow_tests}/profile/profile_test.v (92%)
 rename vlib/v/{tests => slow_tests}/profile/profile_test_1.v (100%)
 rename vlib/v/{tests => slow_tests}/profile/profile_test_2.v (100%)
 rename vlib/v/{tests => slow_tests}/profile/profile_test_3.v (100%)
 rename vlib/v/{tests => slow_tests}/repl/.gitattributes (100%)
 rename vlib/v/{tests => slow_tests}/repl/.gitignore (100%)
 rename vlib/v/{tests => slow_tests}/repl/README.md (100%)
 rename vlib/v/{tests => slow_tests}/repl/array_filter.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/array_init.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/array_method.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/bad_in_type.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/chained_fields/bd.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/chained_fields/c.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/chained_fields/c2.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/chained_fields/d.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/chained_fields/ef.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/comptime_tmpl.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/conditional_blocks/for.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/conditional_blocks/if.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/conditional_blocks/if_else.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/default_printing.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/empty_struct.repl.skip (100%)
 create mode 100644 vlib/v/slow_tests/repl/entire_commented_module.repl
 rename vlib/v/{tests => slow_tests}/repl/error.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/error_and_continue_print.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/error_exitasdfasdf.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/error_nosave.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/fn_calls.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/function.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/immutable_len_fields/fields.1.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/immutable_len_fields/fields.2.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/immutable_len_fields/fields.3.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/import.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/import_alias.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/naked_strings.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/newlines.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/nomain.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/nothing.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/open_close_string_check.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/option.repl.skip (100%)
 rename vlib/v/{tests => slow_tests}/repl/option_call.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/postfix_operators.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/print_and_fn_call.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/println.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/repl_test.v (93%)
 rename vlib/v/{tests => slow_tests}/repl/runner/runner.v (97%)
 rename vlib/v/{tests => slow_tests}/repl/tmpl/hello.txt (100%)
 rename vlib/v/{tests => slow_tests}/repl/var_decl.repl (100%)
 rename vlib/v/{tests => slow_tests}/repl/void_vlib_fncall.repl (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/go_fns_in_different_files_over_the_same_struct/f1.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/go_fns_in_different_files_over_the_same_struct/f2.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/go_fns_in_different_files_over_the_same_struct/main.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/any_test.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/main.v (100%)
 rename vlib/v/{tests => slow_tests}/run_project_folders_test.v (88%)
 rename vlib/v/{tests => slow_tests}/valgrind/1.strings_and_arrays.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/2.heap_objects.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/array_init_with_string_variable.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/base64.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/buffer_passed_in_fn_that_uses_tos_on_it.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/dump_nested_structs.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/fn_returning_string_param.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/fn_with_return_should_free_local_vars.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/free_heap_foos.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/free_variables_in_reverse_order_of_creation.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/if_expr.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/if_expr_skip.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/import_os_and_use_its_constants.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/import_x_json2.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/logging.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/option_reassigned.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/option_simple.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/rand_module.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/rune_methods.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/simple_interpolation.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/simple_interpolation_script_mode.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/simple_interpolation_script_mode_more_scopes.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/string_plus_string_plus.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/string_str_method.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/strings_builder.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/struct_field.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/struct_of_array_of_same_struct.v (100%)
 rename vlib/v/{tests => slow_tests}/valgrind/valgrind_test.v (82%)
 delete mode 100644 vlib/v/tests/inout/bad_st_as.vv
 delete mode 100644 vlib/v/tests/inout/comptime_if_script_mode.vv
 delete mode 100644 vlib/v/tests/inout/dump_expression.out
 delete mode 100644 vlib/v/tests/inout/dump_generic_fn_mut_arg.out
 delete mode 100644 vlib/v/tests/inout/dump_generic_interface_ref_arg.out
 delete mode 100644 vlib/v/tests/inout/dump_match_expr.out
 delete mode 100644 vlib/v/tests/inout/dump_multiple_ptr.out
 delete mode 100644 vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.out
 delete mode 100644 vlib/v/tests/inout/dump_nil_voidptr.out
 delete mode 100644 vlib/v/tests/inout/dump_none.out
 delete mode 100644 vlib/v/tests/inout/dump_shared_arg.out
 delete mode 100644 vlib/v/tests/inout/dump_sumtype_of_fntype.out
 delete mode 100644 vlib/v/tests/inout/hello_devs.vv
 delete mode 100644 vlib/v/tests/inout/struct_field_option.out
 delete mode 100644 vlib/v/tests/inout/tmpl_expand_v_source_code.vv
 delete mode 100644 vlib/v/tests/repl/entire_commented_module.repl

diff --git a/TESTS.md b/TESTS.md
index eb5d3e01d..b0d27f5ff 100644
--- a/TESTS.md
+++ b/TESTS.md
@@ -51,7 +51,7 @@ This folder contains _test.v files, testing the different features of the V
 compiler. Each of them will be compiled, and all the features in them have
 to work (verified by assertions).
 
-## `v vlib/v/tests/inout/compiler_test.v`
+## `v vlib/v/slow_tests/inout/compiler_test.v`
 
 This is a *test runner*, that checks whether the output of running a V program,
 matches an expected .out file. You can also check for code that does panic
@@ -59,7 +59,7 @@ using this test runner - just paste the start of the `panic()` output in the
 corresponding .out file.
 
 NB: these tests, expect to find a pair of `.vv` and `.out` files, in the folder:
-vlib/v/tests/inout
+vlib/v/slow_tests/inout
 
 The test runner will run each `.vv` file, and will check that its output, matches
 the contents of the `.out` file with the same base name. This is particularly useful
@@ -77,7 +77,7 @@ Each `.c.must_have` file, consists of multiple lines. Each of these
 lines, *should* be present *at least once* in the output, when the .vv
 file is compiled with `-o -` .
 
-## `v vlib/v/tests/run_project_folders_test.v`
+## `v vlib/v/slow_tests/run_project_folders_test.v`
 This *test runner*, checks whether whole project folders, can be compiled, and run.
 
 NB: Each project in these folders, should finish with an exit code of 0,
diff --git a/cmd/tools/vtest-cleancode.v b/cmd/tools/vtest-cleancode.v
index 9862750dd..475481cf3 100644
--- a/cmd/tools/vtest-cleancode.v
+++ b/cmd/tools/vtest-cleancode.v
@@ -15,10 +15,10 @@ const vet_known_failing_windows = [
 	'vlib/v/gen/js/tests/testdata/compare_ints.v',
 	'vlib/v/gen/js/tests/testdata/hw.v',
 	'vlib/v/gen/js/tests/testdata/string_methods.v',
-	'vlib/v/tests/inout/vscript_using_generics_in_os.vsh',
+	'vlib/v/slow_tests/inout/vscript_using_generics_in_os.vsh',
 	'vlib/v/tests/project_with_modules_having_submodules/bin/main.vsh',
-	'vlib/v/tests/valgrind/simple_interpolation_script_mode.v',
-	'vlib/v/tests/valgrind/simple_interpolation_script_mode_more_scopes.v',
+	'vlib/v/slow_tests/valgrind/simple_interpolation_script_mode.v',
+	'vlib/v/slow_tests/valgrind/simple_interpolation_script_mode_more_scopes.v',
 ]
 
 const vet_folders = [
diff --git a/cmd/tools/vtest-self.v b/cmd/tools/vtest-self.v
index c9a8f1d42..3a8728a08 100644
--- a/cmd/tools/vtest-self.v
+++ b/cmd/tools/vtest-self.v
@@ -80,7 +80,7 @@ const (
 		'vlib/v/gen/native/macho_test.v',
 		'vlib/v/gen/native/tests/native_test.v',
 		'vlib/v/pkgconfig/pkgconfig_test.v',
-		'vlib/v/tests/inout/compiler_test.v',
+		'vlib/v/slow_tests/inout/compiler_test.v',
 		'vlib/x/json2/json2_test.v',
 	]
 	skip_test_files               = [
@@ -102,11 +102,11 @@ const (
 		'vlib/v/live/live_test.v',
 		'vlib/v/parser/v_parser_test.v',
 		'vlib/v/scanner/scanner_test.v',
-		'vlib/v/tests/inout/compiler_test.v',
-		'vlib/v/tests/prod_test.v',
-		'vlib/v/tests/profile/profile_test.v',
-		'vlib/v/tests/repl/repl_test.v',
-		'vlib/v/tests/valgrind/valgrind_test.v',
+		'vlib/v/slow_tests/inout/compiler_test.v',
+		'vlib/v/slow_tests/prod_test.v',
+		'vlib/v/slow_tests/profile/profile_test.v',
+		'vlib/v/slow_tests/repl/repl_test.v',
+		'vlib/v/slow_tests/valgrind/valgrind_test.v',
 	]
 	skip_with_fsanitize_memory    = [
 		'vlib/net/tcp_simple_client_server_test.v',
@@ -159,7 +159,7 @@ const (
 		'do_not_remove',
 	]
 	skip_on_musl                  = [
-		'vlib/v/tests/profile/profile_test.v',
+		'vlib/v/slow_tests/profile/profile_test.v',
 		'vlib/gg/draw_fns_api_test.v',
 		'vlib/v/tests/skip_unused/gg_code.vv',
 	]
diff --git a/cmd/tools/vvet/vvet.v b/cmd/tools/vvet/vvet.v
index 55d8e2ade..e11d2a672 100644
--- a/cmd/tools/vvet/vvet.v
+++ b/cmd/tools/vvet/vvet.v
@@ -87,7 +87,7 @@ fn main() {
 
 // vet_file vets the file read from `path`.
 fn (mut vt Vet) vet_file(path string) {
-	if path.contains('/tests/') && !vt.opt.is_force {
+	if !vt.opt.is_force && (path.contains('/tests/') || path.contains('/slow_tests/')) {
 		// skip all /tests/ files, since usually their content is not
 		// important enough to be documented/vetted, and they may even
 		// contain intentionally invalid code.
diff --git a/vlib/.vdocignore b/vlib/.vdocignore
index a90554338..90062c230 100644
--- a/vlib/.vdocignore
+++ b/vlib/.vdocignore
@@ -3,6 +3,7 @@ builtin/linux_bare
 builtin/wasm_bare
 os/bare
 v/tests/
+v/slow_tests/
 v/checker/tests/
 v/gen/js/tests/
 v/gen/native/tests/
diff --git a/vlib/net/address.v b/vlib/net/address.v
index fc7ce5a2e..99c52377e 100644
--- a/vlib/net/address.v
+++ b/vlib/net/address.v
@@ -14,7 +14,8 @@ const (
 	addr_ip_any  = [4]u8{init: u8(0)}
 )
 
-fn new_ip6(port u16, addr [16]u8) Addr {
+// new_ip6 creates a new Addr from the IP6 address family, based on the given port and addr
+pub fn new_ip6(port u16, addr [16]u8) Addr {
 	a := Addr{
 		f: u8(AddrFamily.ip6)
 		addr: AddrData{
@@ -29,7 +30,8 @@ fn new_ip6(port u16, addr [16]u8) Addr {
 	return a
 }
 
-fn new_ip(port u16, addr [4]u8) Addr {
+// new_ip creates a new Addr from the IPv4 address family, based on the given port and addr
+pub fn new_ip(port u16, addr [4]u8) Addr {
 	a := Addr{
 		f: u8(AddrFamily.ip)
 		addr: AddrData{
@@ -56,6 +58,7 @@ fn temp_unix() !Addr {
 	return addrs[0]
 }
 
+// family returns the family/kind of the given address `a`
 pub fn (a Addr) family() AddrFamily {
 	return unsafe { AddrFamily(a.f) }
 }
@@ -65,7 +68,8 @@ const (
 	max_ip6_len = 46
 )
 
-fn (a Ip) str() string {
+// str returns a string representation of `a`
+pub fn (a Ip) str() string {
 	buf := [net.max_ip_len]char{}
 
 	res := &char(C.inet_ntop(.ip, &a.addr, &buf[0], buf.len))
@@ -80,7 +84,8 @@ fn (a Ip) str() string {
 	return '${saddr}:${port}'
 }
 
-fn (a Ip6) str() string {
+// str returns a string representation of `a`
+pub fn (a Ip6) str() string {
 	buf := [net.max_ip6_len]char{}
 
 	res := &char(C.inet_ntop(.ip6, &a.addr, &buf[0], buf.len))
@@ -97,7 +102,8 @@ fn (a Ip6) str() string {
 
 const aoffset = __offsetof(Addr, addr)
 
-fn (a Addr) len() u32 {
+// len returns the length in bytes of the address `a`, depending on its family
+pub fn (a Addr) len() u32 {
 	match a.family() {
 		.ip {
 			return sizeof(Ip) + net.aoffset
@@ -114,6 +120,7 @@ fn (a Addr) len() u32 {
 	}
 }
 
+// resolve_addrs converts the given `addr`, `family` and `@type` to a list of addresses
 pub fn resolve_addrs(addr string, family AddrFamily, @type SocketType) ![]Addr {
 	match family {
 		.ip, .ip6, .unspec {
@@ -143,6 +150,7 @@ pub fn resolve_addrs(addr string, family AddrFamily, @type SocketType) ![]Addr {
 	}
 }
 
+// resolve_addrs converts the given `addr` and `@type` to a list of addresses
 pub fn resolve_addrs_fuzzy(addr string, @type SocketType) ![]Addr {
 	if addr.len == 0 {
 		return error('none')
@@ -160,6 +168,7 @@ pub fn resolve_addrs_fuzzy(addr string, @type SocketType) ![]Addr {
 	return resolve_addrs(addr, .unix, @type)
 }
 
+// resolve_ipaddrs converts the given `addr`, `family` and `typ` to a list of addresses
 pub fn resolve_ipaddrs(addr string, family AddrFamily, typ SocketType) ![]Addr {
 	address, port := split_address(addr)!
 
@@ -238,7 +247,8 @@ pub fn resolve_ipaddrs(addr string, family AddrFamily, typ SocketType) ![]Addr {
 	return addresses
 }
 
-fn (a Addr) str() string {
+// str returns a string representation of the address `a`
+pub fn (a Addr) str() string {
 	match unsafe { AddrFamily(a.f) } {
 		.ip {
 			unsafe {
@@ -261,6 +271,7 @@ fn (a Addr) str() string {
 	}
 }
 
+// addr_from_socket_handle returns an address, based on the given integer socket `handle`
 pub fn addr_from_socket_handle(handle int) Addr {
 	addr := Addr{
 		addr: AddrData{
diff --git a/vlib/net/http/header_test.v b/vlib/net/http/header_test.v
index 0013d36fa..f50a94ef8 100644
--- a/vlib/net/http/header_test.v
+++ b/vlib/net/http/header_test.v
@@ -29,7 +29,7 @@ fn test_header_adds_multiple() {
 
 fn test_header_get() {
 	mut h := new_header(key: .dnt, value: 'one')
-	h.add_custom('dnt', 'two')?
+	h.add_custom('dnt', 'two')!
 	dnt := h.get_custom('dnt') or { '' }
 	exact := h.get_custom('dnt', exact: true) or { '' }
 	assert dnt == 'one'
@@ -42,7 +42,7 @@ fn test_header_set() {
 		value: 'two'
 	)
 	assert h.values(.dnt) == ['one', 'two']
-	h.set_custom('DNT', 'three')?
+	h.set_custom('DNT', 'three')!
 	assert h.values(.dnt) == ['three']
 }
 
@@ -67,8 +67,8 @@ fn test_header_delete_not_existing() {
 
 fn test_custom_header() {
 	mut h := new_header()
-	h.add_custom('AbC', 'dEf')?
-	h.add_custom('aBc', 'GhI')?
+	h.add_custom('AbC', 'dEf')!
+	h.add_custom('aBc', 'GhI')!
 	assert h.custom_values('AbC', exact: true) == ['dEf']
 	assert h.custom_values('aBc', exact: true) == ['GhI']
 	assert h.custom_values('ABC') == ['dEf', 'GhI']
@@ -77,13 +77,13 @@ fn test_custom_header() {
 	h.delete_custom('AbC')
 	h.delete_custom('aBc')
 
-	h.add_custom('abc', 'def')?
+	h.add_custom('abc', 'def')!
 	assert h.custom_values('abc') == ['def']
 	assert h.custom_values('ABC') == ['def']
 	assert h.keys() == ['abc']
 	h.delete_custom('abc')
 
-	h.add_custom('accEPT', '*/*')?
+	h.add_custom('accEPT', '*/*')!
 	assert h.custom_values('ACCept') == ['*/*']
 	assert h.values(.accept) == ['*/*']
 	assert h.keys() == ['accEPT']
@@ -91,7 +91,7 @@ fn test_custom_header() {
 
 fn test_contains_custom() {
 	mut h := new_header()
-	h.add_custom('Hello', 'world')?
+	h.add_custom('Hello', 'world')!
 	assert h.contains_custom('hello')
 	assert h.contains_custom('HELLO')
 	assert h.contains_custom('Hello', exact: true)
@@ -101,7 +101,7 @@ fn test_contains_custom() {
 
 fn test_get_custom() {
 	mut h := new_header()
-	h.add_custom('Hello', 'world')?
+	h.add_custom('Hello', 'world')!
 	assert h.get_custom('hello')? == 'world'
 	assert h.get_custom('HELLO')? == 'world'
 	assert h.get_custom('Hello', exact: true)? == 'world'
@@ -117,15 +117,15 @@ fn test_get_custom() {
 
 fn test_starting_with() {
 	mut h := new_header()
-	h.add_custom('Hello-1', 'world')?
-	h.add_custom('Hello-21', 'world')?
+	h.add_custom('Hello-1', 'world')!
+	h.add_custom('Hello-21', 'world')!
 	assert h.starting_with('Hello-')? == 'Hello-1'
 	assert h.starting_with('Hello-2')? == 'Hello-21'
 }
 
 fn test_custom_values() {
 	mut h := new_header()
-	h.add_custom('Hello', 'world')?
+	h.add_custom('Hello', 'world')!
 	assert h.custom_values('hello') == ['world']
 	assert h.custom_values('HELLO') == ['world']
 	assert h.custom_values('Hello', exact: true) == ['world']
@@ -135,7 +135,7 @@ fn test_custom_values() {
 
 fn test_coerce() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
+	h.add_custom('accept', 'foo')!
 	h.add(.accept, 'bar')
 	assert h.values(.accept) == ['foo', 'bar']
 	assert h.keys().len == 2
@@ -147,7 +147,7 @@ fn test_coerce() {
 
 fn test_coerce_canonicalize() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
+	h.add_custom('accept', 'foo')!
 	h.add(.accept, 'bar')
 	assert h.values(.accept) == ['foo', 'bar']
 	assert h.keys().len == 2
@@ -159,9 +159,9 @@ fn test_coerce_canonicalize() {
 
 fn test_coerce_custom() {
 	mut h := new_header()
-	h.add_custom('Hello', 'foo')?
-	h.add_custom('hello', 'bar')?
-	h.add_custom('HELLO', 'baz')?
+	h.add_custom('Hello', 'foo')!
+	h.add_custom('hello', 'bar')!
+	h.add_custom('HELLO', 'baz')!
 	assert h.custom_values('hello') == ['foo', 'bar', 'baz']
 	assert h.keys().len == 3
 
@@ -172,8 +172,8 @@ fn test_coerce_custom() {
 
 fn test_coerce_canonicalize_custom() {
 	mut h := new_header()
-	h.add_custom('foo-BAR', 'foo')?
-	h.add_custom('FOO-bar', 'bar')?
+	h.add_custom('foo-BAR', 'foo')!
+	h.add_custom('FOO-bar', 'bar')!
 	assert h.custom_values('foo-bar') == ['foo', 'bar']
 	assert h.keys().len == 2
 
@@ -184,8 +184,8 @@ fn test_coerce_canonicalize_custom() {
 
 fn test_render_version() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
-	h.add_custom('Accept', 'bar')?
+	h.add_custom('accept', 'foo')!
+	h.add_custom('Accept', 'bar')!
 	h.add(.accept, 'baz')
 
 	s1_0 := h.render(version: .v1_0)
@@ -206,8 +206,8 @@ fn test_render_version() {
 
 fn test_render_coerce() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
-	h.add_custom('Accept', 'bar')?
+	h.add_custom('accept', 'foo')!
+	h.add_custom('Accept', 'bar')!
 	h.add(.accept, 'baz')
 	h.add(.host, 'host')
 
@@ -232,8 +232,8 @@ fn test_render_coerce() {
 
 fn test_render_canonicalize() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
-	h.add_custom('Accept', 'bar')?
+	h.add_custom('accept', 'foo')!
+	h.add_custom('Accept', 'bar')!
 	h.add(.accept, 'baz')
 	h.add(.host, 'host')
 
@@ -258,8 +258,8 @@ fn test_render_canonicalize() {
 
 fn test_render_coerce_canonicalize() {
 	mut h := new_header()
-	h.add_custom('accept', 'foo')?
-	h.add_custom('Accept', 'bar')?
+	h.add_custom('accept', 'foo')!
+	h.add_custom('Accept', 'bar')!
 	h.add(.accept, 'baz')
 	h.add(.host, 'host')
 
@@ -285,8 +285,8 @@ fn test_render_coerce_canonicalize() {
 fn test_str() {
 	mut h := new_header()
 	h.add(.accept, 'text/html')
-	h.add_custom('Accept', 'image/jpeg')?
-	h.add_custom('X-custom', 'Hello')?
+	h.add_custom('Accept', 'image/jpeg')!
+	h.add_custom('X-custom', 'Hello')!
 
 	// key order is not guaranteed
 	assert h.str() == 'Accept: text/html\r\nAccept: image/jpeg\r\nX-custom: Hello\r\n'
@@ -308,7 +308,7 @@ fn test_custom_header_from_map() {
 	h := new_custom_header_from_map({
 		'Server': 'VWeb'
 		'foo':    'bar'
-	})?
+	})!
 	assert h.contains_custom('server')
 	assert h.contains_custom('foo')
 	assert h.get_custom('server') or { '' } == 'VWeb'
@@ -323,7 +323,7 @@ fn test_header_join() {
 	h2 := new_custom_header_from_map({
 		'Server': 'VWeb'
 		'foo':    'bar'
-	})?
+	})!
 	h3 := h1.join(h2)
 	// h1 is unchanged
 	assert h1.contains(.accept)
diff --git a/vlib/net/tcp_test.v b/vlib/net/tcp_test.v
index 044fb0011..fc4b2d2a4 100644
--- a/vlib/net/tcp_test.v
+++ b/vlib/net/tcp_test.v
@@ -30,17 +30,17 @@ fn one_shot_echo_server(mut l net.TcpListener, ch_started chan int) ? {
 	new_conn.close() or {}
 }
 
-fn echo(address string) ? {
-	mut c := net.dial_tcp(address)?
+fn echo(address string) ! {
+	mut c := net.dial_tcp(address)!
 	defer {
 		c.close() or {}
 	}
 
-	println('local: ' + c.addr()?.str())
-	println(' peer: ' + c.peer_addr()?.str())
+	println('local: ' + c.addr()!.str())
+	println(' peer: ' + c.peer_addr()!.str())
 
 	data := 'Hello from vlib/net!'
-	c.write_string(data)?
+	c.write_string(data)!
 	mut buf := []u8{len: 4096}
 	read := c.read(mut buf) or { panic(err) }
 	assert read == data.len
@@ -105,6 +105,6 @@ fn test_bind() {
 	$if !network ? {
 		return
 	}
-	mut conn := net.dial_tcp_with_bind('vlang.io:80', '127.0.0.1:0')?
-	conn.close()?
+	mut conn := net.dial_tcp_with_bind('vlang.io:80', '127.0.0.1:0')!
+	conn.close()!
 }
diff --git a/vlib/net/urllib/urllib_test.v b/vlib/net/urllib/urllib_test.v
index ec9883d81..8556c79f8 100644
--- a/vlib/net/urllib/urllib_test.v
+++ b/vlib/net/urllib/urllib_test.v
@@ -36,8 +36,8 @@ fn test_escape_unescape() {
 }
 
 fn test_parse_query() {
-	q1 := urllib.parse_query('format=%22%25l%3A+%25c+%25t%22')?
-	q2 := urllib.parse_query('format="%l:+%c+%t"')?
+	q1 := urllib.parse_query('format=%22%25l%3A+%25c+%25t%22')!
+	q2 := urllib.parse_query('format="%l:+%c+%t"')!
 	// dump(q1)
 	// dump(q2)
 	assert q1.get('format') == '"%l: %c %t"'
@@ -45,21 +45,21 @@ fn test_parse_query() {
 }
 
 fn test_parse_query_orders() {
-	query_one := urllib.parse_query('https://someapi.com/endpoint?gamma=zalibaba&tau=1&alpha=alibaba&signature=alibaba123')?
+	query_one := urllib.parse_query('https://someapi.com/endpoint?gamma=zalibaba&tau=1&alpha=alibaba&signature=alibaba123')!
 	qvalues := query_one.values()
 	assert qvalues == ['zalibaba', '1', 'alibaba', 'alibaba123']
 }
 
 fn test_parse_missing_host() {
 	// issue #10311
-	url := urllib.parse('http:///')?
+	url := urllib.parse('http:///')!
 	assert url.str() == 'http://///'
 }
 
 // testing the case where the key as a null value
 // e.g ?key=
 fn test_parse_none_value() {
-	query_one := urllib.parse_query('gamma=zalibaba&tau=1&alpha=alibaba&signature=')?
+	query_one := urllib.parse_query('gamma=zalibaba&tau=1&alpha=alibaba&signature=')!
 	qvalues := query_one.values()
 	qvalues_map := query_one.to_map()
 	assert qvalues == ['zalibaba', '1', 'alibaba']
@@ -75,7 +75,7 @@ fn test_parse_none_value() {
 // e.g https://www.vlang.dev?alibaba
 fn test_parse_empty_query_one() {
 	query_str := 'alibaba'
-	query_one := urllib.parse_query(query_str)?
+	query_one := urllib.parse_query(query_str)!
 	qvalues := query_one.values()
 	qvalues_map := query_one.to_map()
 	query_encode := query_one.encode()
@@ -90,7 +90,7 @@ fn test_parse_empty_query_one() {
 // e.g https://www.vlang.dev?
 fn test_parse_empty_query_two() {
 	query_str := ''
-	query_one := urllib.parse_query(query_str)?
+	query_one := urllib.parse_query(query_str)!
 	qvalues := query_one.values()
 	qvalues_map := query_one.to_map()
 	query_encode := query_one.encode()
diff --git a/vlib/v/tests/assembly/asm_test.amd64.v b/vlib/v/slow_tests/assembly/asm_test.amd64.v
similarity index 99%
rename from vlib/v/tests/assembly/asm_test.amd64.v
rename to vlib/v/slow_tests/assembly/asm_test.amd64.v
index e8e7d9eee..fd720d2c9 100644
--- a/vlib/v/tests/assembly/asm_test.amd64.v
+++ b/vlib/v/slow_tests/assembly/asm_test.amd64.v
@@ -1,4 +1,4 @@
-import v.tests.assembly.util
+import v.slow_tests.assembly.util
 
 fn test_inline_asm() {
 	a, mut b := i64(10), i64(0)
diff --git a/vlib/v/tests/assembly/asm_test.i386.v b/vlib/v/slow_tests/assembly/asm_test.i386.v
similarity index 100%
rename from vlib/v/tests/assembly/asm_test.i386.v
rename to vlib/v/slow_tests/assembly/asm_test.i386.v
diff --git a/vlib/v/tests/assembly/naked_attr_test.amd64.v b/vlib/v/slow_tests/assembly/naked_attr_test.amd64.v
similarity index 100%
rename from vlib/v/tests/assembly/naked_attr_test.amd64.v
rename to vlib/v/slow_tests/assembly/naked_attr_test.amd64.v
diff --git a/vlib/v/tests/assembly/naked_attr_test.i386.v b/vlib/v/slow_tests/assembly/naked_attr_test.i386.v
similarity index 100%
rename from vlib/v/tests/assembly/naked_attr_test.i386.v
rename to vlib/v/slow_tests/assembly/naked_attr_test.i386.v
diff --git a/vlib/v/tests/assembly/util/dot_amd64_util.amd64.v b/vlib/v/slow_tests/assembly/util/dot_amd64_util.amd64.v
similarity index 100%
rename from vlib/v/tests/assembly/util/dot_amd64_util.amd64.v
rename to vlib/v/slow_tests/assembly/util/dot_amd64_util.amd64.v
diff --git a/vlib/v/tests/comptime_if_expr_threads_test.v b/vlib/v/slow_tests/comptime_if_expr_threads_test.v
similarity index 100%
rename from vlib/v/tests/comptime_if_expr_threads_test.v
rename to vlib/v/slow_tests/comptime_if_expr_threads_test.v
diff --git a/vlib/v/tests/crun_mode/crun_test.v b/vlib/v/slow_tests/crun_mode/crun_test.v
similarity index 100%
rename from vlib/v/tests/crun_mode/crun_test.v
rename to vlib/v/slow_tests/crun_mode/crun_test.v
diff --git a/vlib/v/tests/inout/.gitignore b/vlib/v/slow_tests/inout/.gitignore
similarity index 100%
rename from vlib/v/tests/inout/.gitignore
rename to vlib/v/slow_tests/inout/.gitignore
diff --git a/vlib/v/tests/inout/bad_st_as.out b/vlib/v/slow_tests/inout/bad_st_as.out
similarity index 100%
rename from vlib/v/tests/inout/bad_st_as.out
rename to vlib/v/slow_tests/inout/bad_st_as.out
diff --git a/vlib/v/slow_tests/inout/bad_st_as.vv b/vlib/v/slow_tests/inout/bad_st_as.vv
new file mode 100644
index 000000000..b0b3f3882
--- /dev/null
+++ b/vlib/v/slow_tests/inout/bad_st_as.vv
@@ -0,0 +1,20 @@
+struct Struct {
+	struct_name string
+}
+
+struct Interface {
+	interface_name string
+}
+
+type Info = Interface | Struct
+
+fn main() {
+	mut info := Info{}
+	info = Struct{
+		struct_name: 'Foo'
+	}
+	s := info as Struct
+	println(s.struct_name)
+	i := info as Interface // wrong
+	println(i.interface_name)
+}
diff --git a/vlib/v/tests/inout/cli_command_no_execute.out b/vlib/v/slow_tests/inout/cli_command_no_execute.out
similarity index 100%
rename from vlib/v/tests/inout/cli_command_no_execute.out
rename to vlib/v/slow_tests/inout/cli_command_no_execute.out
diff --git a/vlib/v/tests/inout/cli_command_no_execute.vv b/vlib/v/slow_tests/inout/cli_command_no_execute.vv
similarity index 83%
rename from vlib/v/tests/inout/cli_command_no_execute.vv
rename to vlib/v/slow_tests/inout/cli_command_no_execute.vv
index fd145e13e..b0c52e46d 100644
--- a/vlib/v/tests/inout/cli_command_no_execute.vv
+++ b/vlib/v/slow_tests/inout/cli_command_no_execute.vv
@@ -1,4 +1,4 @@
-import cli {Command}
+import cli { Command }
 
 fn main() {
 	mut cmd := Command{
diff --git a/vlib/v/tests/inout/cli_root_default_help.out b/vlib/v/slow_tests/inout/cli_root_default_help.out
similarity index 100%
rename from vlib/v/tests/inout/cli_root_default_help.out
rename to vlib/v/slow_tests/inout/cli_root_default_help.out
diff --git a/vlib/v/tests/inout/cli_root_default_help.vv b/vlib/v/slow_tests/inout/cli_root_default_help.vv
similarity index 60%
rename from vlib/v/tests/inout/cli_root_default_help.vv
rename to vlib/v/slow_tests/inout/cli_root_default_help.vv
index 01da855d7..bdabbcb98 100644
--- a/vlib/v/tests/inout/cli_root_default_help.vv
+++ b/vlib/v/slow_tests/inout/cli_root_default_help.vv
@@ -1,8 +1,8 @@
-import cli {Command}
+import cli { Command }
 import os
 
 fn main() {
-	mut cmd := Command {}
+	mut cmd := Command{}
 	cmd.disable_man = true
 	cmd.parse(os.args)
 }
diff --git a/vlib/v/tests/inout/closure_with_fn_variables.out b/vlib/v/slow_tests/inout/closure_with_fn_variables.out
similarity index 100%
rename from vlib/v/tests/inout/closure_with_fn_variables.out
rename to vlib/v/slow_tests/inout/closure_with_fn_variables.out
diff --git a/vlib/v/tests/inout/closure_with_fn_variables.vv b/vlib/v/slow_tests/inout/closure_with_fn_variables.vv
similarity index 100%
rename from vlib/v/tests/inout/closure_with_fn_variables.vv
rename to vlib/v/slow_tests/inout/closure_with_fn_variables.vv
diff --git a/vlib/v/tests/inout/closure_with_nested_closure_var.out b/vlib/v/slow_tests/inout/closure_with_nested_closure_var.out
similarity index 100%
rename from vlib/v/tests/inout/closure_with_nested_closure_var.out
rename to vlib/v/slow_tests/inout/closure_with_nested_closure_var.out
diff --git a/vlib/v/tests/inout/closure_with_nested_closure_var.vv b/vlib/v/slow_tests/inout/closure_with_nested_closure_var.vv
similarity index 80%
rename from vlib/v/tests/inout/closure_with_nested_closure_var.vv
rename to vlib/v/slow_tests/inout/closure_with_nested_closure_var.vv
index 7ac1abe2d..62bbd8b61 100644
--- a/vlib/v/tests/inout/closure_with_nested_closure_var.vv
+++ b/vlib/v/slow_tests/inout/closure_with_nested_closure_var.vv
@@ -15,9 +15,9 @@ fn main() {
 	t := Test1{}
 
 	t.test(fn [t] (t1 Test) {
-		println('$t, $t1')
+		println('${t}, ${t1}')
 		t.test(fn [t] (t2 Test) {
-			println('$t, $t2')
+			println('${t}, ${t2}')
 		})
 	})
 }
diff --git a/vlib/v/tests/inout/compiler_test.v b/vlib/v/slow_tests/inout/compiler_test.v
similarity index 98%
rename from vlib/v/tests/inout/compiler_test.v
rename to vlib/v/slow_tests/inout/compiler_test.v
index 2ca2b7d3a..acff830b8 100644
--- a/vlib/v/tests/inout/compiler_test.v
+++ b/vlib/v/slow_tests/inout/compiler_test.v
@@ -20,7 +20,7 @@ fn test_all() {
 	vroot := os.dir(vexe)
 	os.chdir(vroot) or {}
 	diff_cmd := diff.find_working_diff_command() or { '' }
-	dir := 'vlib/v/tests/inout'
+	dir := 'vlib/v/slow_tests/inout'
 	files := os.ls(dir) or { panic(err) }
 	tests := files.filter(it.ends_with('.vv') || it.ends_with('.vsh'))
 	if tests.len == 0 {
diff --git a/vlib/v/tests/inout/comptime_bool_fields.out b/vlib/v/slow_tests/inout/comptime_bool_fields.out
similarity index 100%
rename from vlib/v/tests/inout/comptime_bool_fields.out
rename to vlib/v/slow_tests/inout/comptime_bool_fields.out
diff --git a/vlib/v/tests/inout/comptime_bool_fields.vv b/vlib/v/slow_tests/inout/comptime_bool_fields.vv
similarity index 100%
rename from vlib/v/tests/inout/comptime_bool_fields.vv
rename to vlib/v/slow_tests/inout/comptime_bool_fields.vv
diff --git a/vlib/v/tests/inout/comptime_if_script_mode.out b/vlib/v/slow_tests/inout/comptime_if_script_mode.out
similarity index 100%
rename from vlib/v/tests/inout/comptime_if_script_mode.out
rename to vlib/v/slow_tests/inout/comptime_if_script_mode.out
diff --git a/vlib/v/slow_tests/inout/comptime_if_script_mode.vv b/vlib/v/slow_tests/inout/comptime_if_script_mode.vv
new file mode 100644
index 000000000..8a1645750
--- /dev/null
+++ b/vlib/v/slow_tests/inout/comptime_if_script_mode.vv
@@ -0,0 +1,5 @@
+$if vinix {
+   println('vinix')
+} $else {
+   println('others')
+}
diff --git a/vlib/v/tests/inout/data_obj.v.templ b/vlib/v/slow_tests/inout/data_obj.v.templ
similarity index 100%
rename from vlib/v/tests/inout/data_obj.v.templ
rename to vlib/v/slow_tests/inout/data_obj.v.templ
diff --git a/vlib/v/slow_tests/inout/dump_expression.out b/vlib/v/slow_tests/inout/dump_expression.out
new file mode 100644
index 000000000..5da89f494
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_expression.out
@@ -0,0 +1,32 @@
+[vlib/v/slow_tests/inout/dump_expression.vv:5] 1: 1
+[vlib/v/slow_tests/inout/dump_expression.vv:10] 'a': a
+[vlib/v/slow_tests/inout/dump_expression.vv:34] a: Aa{
+    log: &log.Logger(log.Log{
+        level: disabled
+        output_label: ''
+        ofile: os.File{
+            cfile: 0
+            fd: 0
+            is_opened: false
+        }
+        output_target: console
+        output_file_name: ''
+    })
+}
+[vlib/v/slow_tests/inout/dump_expression.vv:35] p: Point{
+    x: 1
+    y: 2
+    z: 3
+}
+[vlib/v/slow_tests/inout/dump_expression.vv:36] p_mut: Point{
+    x: 1
+    y: 2
+    z: 3
+}
+[vlib/v/slow_tests/inout/dump_expression.vv:37] p_ptr: &Point{
+    x: 1
+    y: 2
+    z: 3
+}
+[vlib/v/slow_tests/inout/dump_expression.vv:48] os.file_name(vfile): dump_expression.vv
+[vlib/v/slow_tests/inout/dump_expression.vv:51] f.read(mut buf): 10
diff --git a/vlib/v/tests/inout/dump_expression.vv b/vlib/v/slow_tests/inout/dump_expression.vv
similarity index 95%
rename from vlib/v/tests/inout/dump_expression.vv
rename to vlib/v/slow_tests/inout/dump_expression.vv
index bc5442e9d..4f52d5664 100644
--- a/vlib/v/tests/inout/dump_expression.vv
+++ b/vlib/v/slow_tests/inout/dump_expression.vv
@@ -18,7 +18,7 @@ mut:
 	z int
 }
 
-struct Aa{
+struct Aa {
 	log &log.Logger
 }
 
@@ -27,7 +27,9 @@ fn dump_of_struct() {
 	mut p_mut := Point{1, 2, 3}
 	p_ptr := &Point{1, 2, 3}
 	l := &log.Log{}
-	a := Aa{log:l}
+	a := Aa{
+		log: l
+	}
 
 	dump(a)
 	mut x1 := dump(p)
diff --git a/vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.out b/vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.out
new file mode 100644
index 000000000..ca11eb1da
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.out
@@ -0,0 +1 @@
+[vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.vv:11] t: &Reptile{}
diff --git a/vlib/v/tests/inout/dump_generic_fn_mut_arg.vv b/vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_generic_fn_mut_arg.vv
rename to vlib/v/slow_tests/inout/dump_generic_fn_mut_arg.vv
diff --git a/vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.out b/vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.out
new file mode 100644
index 000000000..7632a76fe
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.out
@@ -0,0 +1,6 @@
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:30] mi.in_(): 1.0
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:31] mi.out(): 2.0
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:36] in_put.in_(): 1.0
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:37] in_put.out(): 2.0
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:39] in_put.in_(): 1.0
+[vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv:40] in_put.out(): 2.0
diff --git a/vlib/v/tests/inout/dump_generic_interface_ref_arg.vv b/vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_generic_interface_ref_arg.vv
rename to vlib/v/slow_tests/inout/dump_generic_interface_ref_arg.vv
diff --git a/vlib/v/slow_tests/inout/dump_match_expr.out b/vlib/v/slow_tests/inout/dump_match_expr.out
new file mode 100644
index 000000000..fe2b4c9d1
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_match_expr.out
@@ -0,0 +1 @@
+[vlib/v/slow_tests/inout/dump_match_expr.vv:3] ast.MatchExpr: 1
diff --git a/vlib/v/tests/inout/dump_match_expr.vv b/vlib/v/slow_tests/inout/dump_match_expr.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_match_expr.vv
rename to vlib/v/slow_tests/inout/dump_match_expr.vv
diff --git a/vlib/v/slow_tests/inout/dump_multiple_ptr.out b/vlib/v/slow_tests/inout/dump_multiple_ptr.out
new file mode 100644
index 000000000..bac91801e
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_multiple_ptr.out
@@ -0,0 +1,4 @@
+[vlib/v/slow_tests/inout/dump_multiple_ptr.vv:3] i: 42
+[vlib/v/slow_tests/inout/dump_multiple_ptr.vv:5] ir: &42
+[vlib/v/slow_tests/inout/dump_multiple_ptr.vv:7] irr: &&42
+[vlib/v/slow_tests/inout/dump_multiple_ptr.vv:9] irrr: &&&42
diff --git a/vlib/v/tests/inout/dump_multiple_ptr.vv b/vlib/v/slow_tests/inout/dump_multiple_ptr.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_multiple_ptr.vv
rename to vlib/v/slow_tests/inout/dump_multiple_ptr.vv
diff --git a/vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.out b/vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.out
new file mode 100644
index 000000000..1dcb5ddca
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.out
@@ -0,0 +1,23 @@
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': int 1
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': int 1
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:36] next(1): 0.0
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': f64 1.0
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': f64 1.0
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:37] next(1.0): 64.0
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': f64 11.1
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': f64 11.1
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:38] next(11.1): 64.0
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:15] '${T.name} $input': Score Score{
+    ave: 23.4
+}
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': Score Score{
+    ave: 23.4
+}
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:42] next(ave): 23.4
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:15] '${T.name} $input': &Score &Score{
+    ave: 23.4
+}
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': &Score &Score{
+    ave: 23.4
+}
+[vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv:43] next(&ave): 23.4
diff --git a/vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv b/vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv
similarity index 82%
rename from vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv
rename to vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv
index 0c6a0fcf9..eef4d49b4 100644
--- a/vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv
+++ b/vlib/v/slow_tests/inout/dump_nested_generic_fn_call_ref_arg.vv
@@ -12,18 +12,18 @@ pub fn (s &Score) ave() f64 {
 
 fn next[T](input T) f64 {
 	$if T is Average {
-		dump('${T.name} $input')
+		dump('${T.name} ${input}')
 		ret := next2[T](input)
 		return ret
 	} $else {
-		dump('${T.name} $input')
+		dump('${T.name} ${input}')
 		ret := next2[T](input)
 		return ret
 	}
 }
 
 fn next2[T](input T) f64 {
-	dump('${T.name} $input')
+	dump('${T.name} ${input}')
 	$if T is Average {
 		return input.ave()
 	} $else $if T is f64 {
@@ -36,7 +36,7 @@ fn main() {
 	dump(next(1))
 	dump(next(1.0))
 	dump(next(11.1))
-	ave := Score {
+	ave := Score{
 		ave: 23.4
 	}
 	dump(next(ave))
diff --git a/vlib/v/slow_tests/inout/dump_nil_voidptr.out b/vlib/v/slow_tests/inout/dump_nil_voidptr.out
new file mode 100644
index 000000000..ea9e45231
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_nil_voidptr.out
@@ -0,0 +1,2 @@
+[vlib/v/slow_tests/inout/dump_nil_voidptr.vv:11] a: &nil
+[vlib/v/slow_tests/inout/dump_nil_voidptr.vv:13] a: &nil
diff --git a/vlib/v/tests/inout/dump_nil_voidptr.vv b/vlib/v/slow_tests/inout/dump_nil_voidptr.vv
similarity index 86%
rename from vlib/v/tests/inout/dump_nil_voidptr.vv
rename to vlib/v/slow_tests/inout/dump_nil_voidptr.vv
index 3f3dac554..e67a82053 100644
--- a/vlib/v/tests/inout/dump_nil_voidptr.vv
+++ b/vlib/v/slow_tests/inout/dump_nil_voidptr.vv
@@ -3,7 +3,7 @@ fn get_nil() ?&int {
 }
 
 fn get_voidptr() ?&int {
-	return voidptr(0)
+	return unsafe { nil }
 }
 
 fn main() {
diff --git a/vlib/v/slow_tests/inout/dump_none.out b/vlib/v/slow_tests/inout/dump_none.out
new file mode 100644
index 000000000..799e2b1dc
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_none.out
@@ -0,0 +1 @@
+[vlib/v/slow_tests/inout/dump_none.vv:2] none: none
diff --git a/vlib/v/tests/inout/dump_none.vv b/vlib/v/slow_tests/inout/dump_none.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_none.vv
rename to vlib/v/slow_tests/inout/dump_none.vv
diff --git a/vlib/v/slow_tests/inout/dump_shared_arg.out b/vlib/v/slow_tests/inout/dump_shared_arg.out
new file mode 100644
index 000000000..d20809439
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_shared_arg.out
@@ -0,0 +1,3 @@
+[vlib/v/slow_tests/inout/dump_shared_arg.vv:12] inst: &AtomicStruct{
+    a: 1
+}
diff --git a/vlib/v/tests/inout/dump_shared_arg.vv b/vlib/v/slow_tests/inout/dump_shared_arg.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_shared_arg.vv
rename to vlib/v/slow_tests/inout/dump_shared_arg.vv
diff --git a/vlib/v/slow_tests/inout/dump_sumtype_of_fntype.out b/vlib/v/slow_tests/inout/dump_sumtype_of_fntype.out
new file mode 100644
index 000000000..e0f528089
--- /dev/null
+++ b/vlib/v/slow_tests/inout/dump_sumtype_of_fntype.out
@@ -0,0 +1 @@
+[vlib/v/slow_tests/inout/dump_sumtype_of_fntype.vv:10] main.MyFnSumtype(main.f): MyFnSumtype(fn (int) v.ast.Expr)
diff --git a/vlib/v/tests/inout/dump_sumtype_of_fntype.vv b/vlib/v/slow_tests/inout/dump_sumtype_of_fntype.vv
similarity index 100%
rename from vlib/v/tests/inout/dump_sumtype_of_fntype.vv
rename to vlib/v/slow_tests/inout/dump_sumtype_of_fntype.vv
diff --git a/vlib/v/tests/inout/embedded.html b/vlib/v/slow_tests/inout/embedded.html
similarity index 100%
rename from vlib/v/tests/inout/embedded.html
rename to vlib/v/slow_tests/inout/embedded.html
diff --git a/vlib/v/tests/inout/enum_print.out b/vlib/v/slow_tests/inout/enum_print.out
similarity index 100%
rename from vlib/v/tests/inout/enum_print.out
rename to vlib/v/slow_tests/inout/enum_print.out
diff --git a/vlib/v/tests/inout/enum_print.vv b/vlib/v/slow_tests/inout/enum_print.vv
similarity index 92%
rename from vlib/v/tests/inout/enum_print.vv
rename to vlib/v/slow_tests/inout/enum_print.vv
index 3602ca09d..21cd25324 100644
--- a/vlib/v/tests/inout/enum_print.vv
+++ b/vlib/v/slow_tests/inout/enum_print.vv
@@ -13,7 +13,9 @@ struct Aaa {
 
 fn main() {
 	col := Color.green
-	a := Aaa{color: col}
+	a := Aaa{
+		color: col
+	}
 	orange := Color.orange
 	println(orange)
 	println(Color.yellow)
diff --git a/vlib/v/tests/inout/file.html b/vlib/v/slow_tests/inout/file.html
similarity index 100%
rename from vlib/v/tests/inout/file.html
rename to vlib/v/slow_tests/inout/file.html
diff --git a/vlib/v/tests/inout/file.md b/vlib/v/slow_tests/inout/file.md
similarity index 100%
rename from vlib/v/tests/inout/file.md
rename to vlib/v/slow_tests/inout/file.md
diff --git a/vlib/v/tests/inout/fixed_array_index.out b/vlib/v/slow_tests/inout/fixed_array_index.out
similarity index 100%
rename from vlib/v/tests/inout/fixed_array_index.out
rename to vlib/v/slow_tests/inout/fixed_array_index.out
diff --git a/vlib/v/tests/inout/fixed_array_index.vv b/vlib/v/slow_tests/inout/fixed_array_index.vv
similarity index 69%
rename from vlib/v/tests/inout/fixed_array_index.vv
rename to vlib/v/slow_tests/inout/fixed_array_index.vv
index 15fef607b..05edcde64 100644
--- a/vlib/v/tests/inout/fixed_array_index.vv
+++ b/vlib/v/slow_tests/inout/fixed_array_index.vv
@@ -1,4 +1,4 @@
-a := [1,2]!
+a := [1, 2]!
 println(a[0])
 i := 2
 _ = a[i]
diff --git a/vlib/v/tests/inout/fixed_array_slice.out b/vlib/v/slow_tests/inout/fixed_array_slice.out
similarity index 100%
rename from vlib/v/tests/inout/fixed_array_slice.out
rename to vlib/v/slow_tests/inout/fixed_array_slice.out
diff --git a/vlib/v/tests/inout/fixed_array_slice.vv b/vlib/v/slow_tests/inout/fixed_array_slice.vv
similarity index 59%
rename from vlib/v/tests/inout/fixed_array_slice.vv
rename to vlib/v/slow_tests/inout/fixed_array_slice.vv
index 56dc0e9f8..4d7aaf6d5 100644
--- a/vlib/v/tests/inout/fixed_array_slice.vv
+++ b/vlib/v/slow_tests/inout/fixed_array_slice.vv
@@ -1,3 +1,3 @@
-a := [1,2]!
+a := [1, 2]!
 i := 3
 _ = a[i..i]
diff --git a/vlib/v/tests/inout/footer.md b/vlib/v/slow_tests/inout/footer.md
similarity index 100%
rename from vlib/v/tests/inout/footer.md
rename to vlib/v/slow_tests/inout/footer.md
diff --git a/vlib/v/tests/inout/generic_fn_with_array_arg.out b/vlib/v/slow_tests/inout/generic_fn_with_array_arg.out
similarity index 100%
rename from vlib/v/tests/inout/generic_fn_with_array_arg.out
rename to vlib/v/slow_tests/inout/generic_fn_with_array_arg.out
diff --git a/vlib/v/tests/inout/generic_fn_with_array_arg.vv b/vlib/v/slow_tests/inout/generic_fn_with_array_arg.vv
similarity index 100%
rename from vlib/v/tests/inout/generic_fn_with_array_arg.vv
rename to vlib/v/slow_tests/inout/generic_fn_with_array_arg.vv
diff --git a/vlib/v/tests/inout/go_print.out b/vlib/v/slow_tests/inout/go_print.out
similarity index 100%
rename from vlib/v/tests/inout/go_print.out
rename to vlib/v/slow_tests/inout/go_print.out
diff --git a/vlib/v/tests/inout/go_print.vv b/vlib/v/slow_tests/inout/go_print.vv
similarity index 61%
rename from vlib/v/tests/inout/go_print.vv
rename to vlib/v/slow_tests/inout/go_print.vv
index e7ddd5c6a..2658bab9e 100644
--- a/vlib/v/tests/inout/go_print.vv
+++ b/vlib/v/slow_tests/inout/go_print.vv
@@ -1,5 +1,5 @@
-fn main(){
-	g := go print([1, 2, 3])
+fn main() {
+	g := spawn print([1, 2, 3])
 	g.wait()
 	println('')
 	g2 := spawn print([4, 5, 6])
diff --git a/vlib/v/tests/inout/header.md b/vlib/v/slow_tests/inout/header.md
similarity index 100%
rename from vlib/v/tests/inout/header.md
rename to vlib/v/slow_tests/inout/header.md
diff --git a/vlib/v/tests/inout/hello.out b/vlib/v/slow_tests/inout/hello.out
similarity index 100%
rename from vlib/v/tests/inout/hello.out
rename to vlib/v/slow_tests/inout/hello.out
diff --git a/vlib/v/tests/inout/hello.vv b/vlib/v/slow_tests/inout/hello.vv
similarity index 100%
rename from vlib/v/tests/inout/hello.vv
rename to vlib/v/slow_tests/inout/hello.vv
diff --git a/vlib/v/tests/inout/hello_devs.out b/vlib/v/slow_tests/inout/hello_devs.out
similarity index 100%
rename from vlib/v/tests/inout/hello_devs.out
rename to vlib/v/slow_tests/inout/hello_devs.out
diff --git a/vlib/v/slow_tests/inout/hello_devs.vv b/vlib/v/slow_tests/inout/hello_devs.vv
new file mode 100644
index 000000000..fd56e40cb
--- /dev/null
+++ b/vlib/v/slow_tests/inout/hello_devs.vv
@@ -0,0 +1,7 @@
+fn main() {
+	areas := ['game', 'web', 'tools', 'science', 'systems', 'embedded']
+	for i := 0; i < areas.len; i++ {
+		area := areas[i]
+		println('Hello, ${area} developers!')
+	}
+}
diff --git a/vlib/v/tests/inout/nested_generic_fn_call.out b/vlib/v/slow_tests/inout/nested_generic_fn_call.out
similarity index 100%
rename from vlib/v/tests/inout/nested_generic_fn_call.out
rename to vlib/v/slow_tests/inout/nested_generic_fn_call.out
diff --git a/vlib/v/tests/inout/nested_generic_fn_call.vv b/vlib/v/slow_tests/inout/nested_generic_fn_call.vv
similarity index 100%
rename from vlib/v/tests/inout/nested_generic_fn_call.vv
rename to vlib/v/slow_tests/inout/nested_generic_fn_call.vv
diff --git a/vlib/v/tests/inout/nested_structs.out b/vlib/v/slow_tests/inout/nested_structs.out
similarity index 100%
rename from vlib/v/tests/inout/nested_structs.out
rename to vlib/v/slow_tests/inout/nested_structs.out
diff --git a/vlib/v/tests/inout/nested_structs.vv b/vlib/v/slow_tests/inout/nested_structs.vv
similarity index 94%
rename from vlib/v/tests/inout/nested_structs.vv
rename to vlib/v/slow_tests/inout/nested_structs.vv
index b73aa177e..4cb29bd7e 100644
--- a/vlib/v/tests/inout/nested_structs.vv
+++ b/vlib/v/slow_tests/inout/nested_structs.vv
@@ -11,7 +11,7 @@ fn (b &Bbb) print() {
 
 struct Aaa {
 	test bool
-	b Bbb
+	b    Bbb
 }
 
 fn main() {
diff --git a/vlib/v/tests/inout/option_fn_arg.out b/vlib/v/slow_tests/inout/option_fn_arg.out
similarity index 100%
rename from vlib/v/tests/inout/option_fn_arg.out
rename to vlib/v/slow_tests/inout/option_fn_arg.out
diff --git a/vlib/v/tests/inout/option_fn_arg.vv b/vlib/v/slow_tests/inout/option_fn_arg.vv
similarity index 100%
rename from vlib/v/tests/inout/option_fn_arg.vv
rename to vlib/v/slow_tests/inout/option_fn_arg.vv
diff --git a/vlib/v/tests/inout/os.out b/vlib/v/slow_tests/inout/os.out
similarity index 100%
rename from vlib/v/tests/inout/os.out
rename to vlib/v/slow_tests/inout/os.out
diff --git a/vlib/v/tests/inout/os.vv b/vlib/v/slow_tests/inout/os.vv
similarity index 100%
rename from vlib/v/tests/inout/os.vv
rename to vlib/v/slow_tests/inout/os.vv
diff --git a/vlib/v/tests/inout/panic_with_cg.out b/vlib/v/slow_tests/inout/panic_with_cg.out
similarity index 66%
rename from vlib/v/tests/inout/panic_with_cg.out
rename to vlib/v/slow_tests/inout/panic_with_cg.out
index 3c27f3cd1..b87ddef1d 100644
--- a/vlib/v/tests/inout/panic_with_cg.out
+++ b/vlib/v/slow_tests/inout/panic_with_cg.out
@@ -2,4 +2,4 @@
    module: main
  function: buggy_function()
   message: panicing...
-     file: vlib/v/tests/inout/panic_with_cg.vv:3
+     file: vlib/v/slow_tests/inout/panic_with_cg.vv:2
diff --git a/vlib/v/tests/inout/panic_with_cg.vv b/vlib/v/slow_tests/inout/panic_with_cg.vv
similarity index 59%
rename from vlib/v/tests/inout/panic_with_cg.vv
rename to vlib/v/slow_tests/inout/panic_with_cg.vv
index 7e2fb4f91..05c6fb1c6 100644
--- a/vlib/v/tests/inout/panic_with_cg.vv
+++ b/vlib/v/slow_tests/inout/panic_with_cg.vv
@@ -1,8 +1,7 @@
-
 fn buggy_function() {
 	panic('panicing...')
 }
 
-fn main(){
-	buggy_function()    
+fn main() {
+	buggy_function()
 }
diff --git a/vlib/v/tests/inout/printing_alias_has_str_method.out b/vlib/v/slow_tests/inout/printing_alias_has_str_method.out
similarity index 100%
rename from vlib/v/tests/inout/printing_alias_has_str_method.out
rename to vlib/v/slow_tests/inout/printing_alias_has_str_method.out
diff --git a/vlib/v/tests/inout/printing_alias_has_str_method.vv b/vlib/v/slow_tests/inout/printing_alias_has_str_method.vv
similarity index 87%
rename from vlib/v/tests/inout/printing_alias_has_str_method.vv
rename to vlib/v/slow_tests/inout/printing_alias_has_str_method.vv
index 0d610df2f..c80dd90b3 100644
--- a/vlib/v/tests/inout/printing_alias_has_str_method.vv
+++ b/vlib/v/slow_tests/inout/printing_alias_has_str_method.vv
@@ -8,5 +8,5 @@ fn main() {
 	b := Byte(`a`)
 	println(b)
 	println(b.str())
-	println('$b')
+	println('${b}')
 }
diff --git a/vlib/v/tests/inout/printing_aliases_of_multi_fixed_array.out b/vlib/v/slow_tests/inout/printing_aliases_of_multi_fixed_array.out
similarity index 100%
rename from vlib/v/tests/inout/printing_aliases_of_multi_fixed_array.out
rename to vlib/v/slow_tests/inout/printing_aliases_of_multi_fixed_array.out
diff --git a/vlib/v/tests/inout/printing_aliases_of_multi_fixed_array.vv b/vlib/v/slow_tests/inout/printing_aliases_of_multi_fixed_array.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_aliases_of_multi_fixed_array.vv
rename to vlib/v/slow_tests/inout/printing_aliases_of_multi_fixed_array.vv
diff --git a/vlib/v/tests/inout/printing_complex_if_exprs_output.out b/vlib/v/slow_tests/inout/printing_complex_if_exprs_output.out
similarity index 100%
rename from vlib/v/tests/inout/printing_complex_if_exprs_output.out
rename to vlib/v/slow_tests/inout/printing_complex_if_exprs_output.out
diff --git a/vlib/v/tests/inout/printing_complex_if_exprs_output.vv b/vlib/v/slow_tests/inout/printing_complex_if_exprs_output.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_complex_if_exprs_output.vv
rename to vlib/v/slow_tests/inout/printing_complex_if_exprs_output.vv
diff --git a/vlib/v/tests/inout/printing_comptime_if.out b/vlib/v/slow_tests/inout/printing_comptime_if.out
similarity index 100%
rename from vlib/v/tests/inout/printing_comptime_if.out
rename to vlib/v/slow_tests/inout/printing_comptime_if.out
diff --git a/vlib/v/tests/inout/printing_comptime_if.vv b/vlib/v/slow_tests/inout/printing_comptime_if.vv
similarity index 74%
rename from vlib/v/tests/inout/printing_comptime_if.vv
rename to vlib/v/slow_tests/inout/printing_comptime_if.vv
index 7195cadb7..e401ee576 100644
--- a/vlib/v/tests/inout/printing_comptime_if.vv
+++ b/vlib/v/slow_tests/inout/printing_comptime_if.vv
@@ -5,6 +5,6 @@ fn main() {
 
 fn proc[T](input T) {
 	$if T is &u8 {
-		println('T is $T.name')
+		println('T is ${T.name}')
 	}
 }
diff --git a/vlib/v/tests/inout/printing_fixed_array_of_pointers.out b/vlib/v/slow_tests/inout/printing_fixed_array_of_pointers.out
similarity index 100%
rename from vlib/v/tests/inout/printing_fixed_array_of_pointers.out
rename to vlib/v/slow_tests/inout/printing_fixed_array_of_pointers.out
diff --git a/vlib/v/tests/inout/printing_fixed_array_of_pointers.vv b/vlib/v/slow_tests/inout/printing_fixed_array_of_pointers.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_fixed_array_of_pointers.vv
rename to vlib/v/slow_tests/inout/printing_fixed_array_of_pointers.vv
diff --git a/vlib/v/tests/inout/printing_for_v_in_a.out b/vlib/v/slow_tests/inout/printing_for_v_in_a.out
similarity index 100%
rename from vlib/v/tests/inout/printing_for_v_in_a.out
rename to vlib/v/slow_tests/inout/printing_for_v_in_a.out
diff --git a/vlib/v/tests/inout/printing_for_v_in_a.vv b/vlib/v/slow_tests/inout/printing_for_v_in_a.vv
similarity index 90%
rename from vlib/v/tests/inout/printing_for_v_in_a.vv
rename to vlib/v/slow_tests/inout/printing_for_v_in_a.vv
index 5b1486f99..96b26127f 100644
--- a/vlib/v/tests/inout/printing_for_v_in_a.vv
+++ b/vlib/v/slow_tests/inout/printing_for_v_in_a.vv
@@ -13,7 +13,7 @@ fn abc(a Any) {
 	}
 	if a is map[string]string {
 		for k, v in a {
-			println('> k: $k | v: $v')
+			println('> k: ${k} | v: ${v}')
 		}
 	}
 	println(@FN)
diff --git a/vlib/v/tests/inout/printing_multi_fixed_array.out b/vlib/v/slow_tests/inout/printing_multi_fixed_array.out
similarity index 100%
rename from vlib/v/tests/inout/printing_multi_fixed_array.out
rename to vlib/v/slow_tests/inout/printing_multi_fixed_array.out
diff --git a/vlib/v/tests/inout/printing_multi_fixed_array.vv b/vlib/v/slow_tests/inout/printing_multi_fixed_array.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_multi_fixed_array.vv
rename to vlib/v/slow_tests/inout/printing_multi_fixed_array.vv
diff --git a/vlib/v/tests/inout/printing_nested_generic_struct.out b/vlib/v/slow_tests/inout/printing_nested_generic_struct.out
similarity index 100%
rename from vlib/v/tests/inout/printing_nested_generic_struct.out
rename to vlib/v/slow_tests/inout/printing_nested_generic_struct.out
diff --git a/vlib/v/tests/inout/printing_nested_generic_struct.vv b/vlib/v/slow_tests/inout/printing_nested_generic_struct.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_nested_generic_struct.vv
rename to vlib/v/slow_tests/inout/printing_nested_generic_struct.vv
diff --git a/vlib/v/tests/inout/printing_option_in_if_expr.out b/vlib/v/slow_tests/inout/printing_option_in_if_expr.out
similarity index 100%
rename from vlib/v/tests/inout/printing_option_in_if_expr.out
rename to vlib/v/slow_tests/inout/printing_option_in_if_expr.out
diff --git a/vlib/v/tests/inout/printing_option_in_if_expr.vv b/vlib/v/slow_tests/inout/printing_option_in_if_expr.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_option_in_if_expr.vv
rename to vlib/v/slow_tests/inout/printing_option_in_if_expr.vv
diff --git a/vlib/v/tests/inout/printing_reference_alias.out b/vlib/v/slow_tests/inout/printing_reference_alias.out
similarity index 100%
rename from vlib/v/tests/inout/printing_reference_alias.out
rename to vlib/v/slow_tests/inout/printing_reference_alias.out
diff --git a/vlib/v/tests/inout/printing_reference_alias.vv b/vlib/v/slow_tests/inout/printing_reference_alias.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_reference_alias.vv
rename to vlib/v/slow_tests/inout/printing_reference_alias.vv
diff --git a/vlib/v/tests/inout/printing_reference_enum.out b/vlib/v/slow_tests/inout/printing_reference_enum.out
similarity index 100%
rename from vlib/v/tests/inout/printing_reference_enum.out
rename to vlib/v/slow_tests/inout/printing_reference_enum.out
diff --git a/vlib/v/tests/inout/printing_reference_enum.vv b/vlib/v/slow_tests/inout/printing_reference_enum.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_reference_enum.vv
rename to vlib/v/slow_tests/inout/printing_reference_enum.vv
diff --git a/vlib/v/tests/inout/printing_reference_struct.out b/vlib/v/slow_tests/inout/printing_reference_struct.out
similarity index 100%
rename from vlib/v/tests/inout/printing_reference_struct.out
rename to vlib/v/slow_tests/inout/printing_reference_struct.out
diff --git a/vlib/v/tests/inout/printing_reference_struct.vv b/vlib/v/slow_tests/inout/printing_reference_struct.vv
similarity index 81%
rename from vlib/v/tests/inout/printing_reference_struct.vv
rename to vlib/v/slow_tests/inout/printing_reference_struct.vv
index 7b142ea32..c886ce30b 100644
--- a/vlib/v/tests/inout/printing_reference_struct.vv
+++ b/vlib/v/slow_tests/inout/printing_reference_struct.vv
@@ -1,4 +1,4 @@
-struct AStruct{}
+struct AStruct {}
 
 fn main() {
 	ast := &AStruct{}
diff --git a/vlib/v/tests/inout/printing_result_in_infix_expr.out b/vlib/v/slow_tests/inout/printing_result_in_infix_expr.out
similarity index 100%
rename from vlib/v/tests/inout/printing_result_in_infix_expr.out
rename to vlib/v/slow_tests/inout/printing_result_in_infix_expr.out
diff --git a/vlib/v/tests/inout/printing_result_in_infix_expr.vv b/vlib/v/slow_tests/inout/printing_result_in_infix_expr.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_result_in_infix_expr.vv
rename to vlib/v/slow_tests/inout/printing_result_in_infix_expr.vv
diff --git a/vlib/v/tests/inout/printing_result_in_infix_expr2.out b/vlib/v/slow_tests/inout/printing_result_in_infix_expr2.out
similarity index 100%
rename from vlib/v/tests/inout/printing_result_in_infix_expr2.out
rename to vlib/v/slow_tests/inout/printing_result_in_infix_expr2.out
diff --git a/vlib/v/tests/inout/printing_result_in_infix_expr2.vv b/vlib/v/slow_tests/inout/printing_result_in_infix_expr2.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_result_in_infix_expr2.vv
rename to vlib/v/slow_tests/inout/printing_result_in_infix_expr2.vv
diff --git a/vlib/v/tests/inout/printing_slice_of_multiline_raw_string.out b/vlib/v/slow_tests/inout/printing_slice_of_multiline_raw_string.out
similarity index 100%
rename from vlib/v/tests/inout/printing_slice_of_multiline_raw_string.out
rename to vlib/v/slow_tests/inout/printing_slice_of_multiline_raw_string.out
diff --git a/vlib/v/tests/inout/printing_slice_of_multiline_raw_string.vv b/vlib/v/slow_tests/inout/printing_slice_of_multiline_raw_string.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_slice_of_multiline_raw_string.vv
rename to vlib/v/slow_tests/inout/printing_slice_of_multiline_raw_string.vv
diff --git a/vlib/v/tests/inout/printing_struct_with_skip_fields.out b/vlib/v/slow_tests/inout/printing_struct_with_skip_fields.out
similarity index 100%
rename from vlib/v/tests/inout/printing_struct_with_skip_fields.out
rename to vlib/v/slow_tests/inout/printing_struct_with_skip_fields.out
diff --git a/vlib/v/tests/inout/printing_struct_with_skip_fields.vv b/vlib/v/slow_tests/inout/printing_struct_with_skip_fields.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_struct_with_skip_fields.vv
rename to vlib/v/slow_tests/inout/printing_struct_with_skip_fields.vv
diff --git a/vlib/v/tests/inout/printing_sumtype_with_none.out b/vlib/v/slow_tests/inout/printing_sumtype_with_none.out
similarity index 100%
rename from vlib/v/tests/inout/printing_sumtype_with_none.out
rename to vlib/v/slow_tests/inout/printing_sumtype_with_none.out
diff --git a/vlib/v/tests/inout/printing_sumtype_with_none.vv b/vlib/v/slow_tests/inout/printing_sumtype_with_none.vv
similarity index 100%
rename from vlib/v/tests/inout/printing_sumtype_with_none.vv
rename to vlib/v/slow_tests/inout/printing_sumtype_with_none.vv
diff --git a/vlib/v/tests/inout/push_on_closed_channel.out b/vlib/v/slow_tests/inout/push_on_closed_channel.out
similarity index 100%
rename from vlib/v/tests/inout/push_on_closed_channel.out
rename to vlib/v/slow_tests/inout/push_on_closed_channel.out
diff --git a/vlib/v/tests/inout/push_on_closed_channel.vv b/vlib/v/slow_tests/inout/push_on_closed_channel.vv
similarity index 100%
rename from vlib/v/tests/inout/push_on_closed_channel.vv
rename to vlib/v/slow_tests/inout/push_on_closed_channel.vv
diff --git a/vlib/v/tests/inout/push_work_on_channel.out b/vlib/v/slow_tests/inout/push_work_on_channel.out
similarity index 100%
rename from vlib/v/tests/inout/push_work_on_channel.out
rename to vlib/v/slow_tests/inout/push_work_on_channel.out
diff --git a/vlib/v/tests/inout/push_work_on_channel.vv b/vlib/v/slow_tests/inout/push_work_on_channel.vv
similarity index 88%
rename from vlib/v/tests/inout/push_work_on_channel.vv
rename to vlib/v/slow_tests/inout/push_work_on_channel.vv
index 90dedbf0a..9aa75758f 100644
--- a/vlib/v/tests/inout/push_work_on_channel.vv
+++ b/vlib/v/slow_tests/inout/push_work_on_channel.vv
@@ -5,7 +5,7 @@ fn work(input chan u32, started chan bool) {
 	started <- true
 	for {
 		x := <-input or { break }
-		println('> work x: $x')
+		println('> work x: ${x}')
 		time.sleep(50 * time.millisecond)
 	}
 	println('> work ended')
@@ -18,7 +18,7 @@ fn main() {
 	for x in 0 .. 10 {
 		ch <- x
 	}
-	task := go work(ch, work_started)
+	task := spawn work(ch, work_started)
 	_ := <-work_started
 
 	ch.close()
diff --git a/vlib/v/tests/inout/smart_quote.out b/vlib/v/slow_tests/inout/smart_quote.out
similarity index 100%
rename from vlib/v/tests/inout/smart_quote.out
rename to vlib/v/slow_tests/inout/smart_quote.out
diff --git a/vlib/v/tests/inout/smart_quote.vv b/vlib/v/slow_tests/inout/smart_quote.vv
similarity index 100%
rename from vlib/v/tests/inout/smart_quote.vv
rename to vlib/v/slow_tests/inout/smart_quote.vv
diff --git a/vlib/v/tests/inout/strconv_v_printf.out b/vlib/v/slow_tests/inout/strconv_v_printf.out
similarity index 100%
rename from vlib/v/tests/inout/strconv_v_printf.out
rename to vlib/v/slow_tests/inout/strconv_v_printf.out
diff --git a/vlib/v/tests/inout/strconv_v_printf.vv b/vlib/v/slow_tests/inout/strconv_v_printf.vv
similarity index 94%
rename from vlib/v/tests/inout/strconv_v_printf.vv
rename to vlib/v/slow_tests/inout/strconv_v_printf.vv
index d7e5cc1bb..3d183e42b 100644
--- a/vlib/v/tests/inout/strconv_v_printf.vv
+++ b/vlib/v/slow_tests/inout/strconv_v_printf.vv
@@ -34,7 +34,7 @@ fn main() {
 			strconv.v_printf('%3d', n)
 		}
 		if n % 20 == 0 {
-			println('iter: $n')
+			println('iter: ${n}')
 		}
 	}
 }
diff --git a/vlib/v/tests/inout/string_interp.out b/vlib/v/slow_tests/inout/string_interp.out
similarity index 100%
rename from vlib/v/tests/inout/string_interp.out
rename to vlib/v/slow_tests/inout/string_interp.out
diff --git a/vlib/v/tests/inout/string_interp.vv b/vlib/v/slow_tests/inout/string_interp.vv
similarity index 60%
rename from vlib/v/tests/inout/string_interp.vv
rename to vlib/v/slow_tests/inout/string_interp.vv
index 8f81233b2..613fe34ff 100644
--- a/vlib/v/tests/inout/string_interp.vv
+++ b/vlib/v/slow_tests/inout/string_interp.vv
@@ -1,5 +1,5 @@
 fn main() {
 	test := 'hello'
 	hello := 'world'
-	println('%.*s$hello$test')
+	println('%.*s${hello}${test}')
 }
diff --git a/vlib/v/slow_tests/inout/struct_field_option.out b/vlib/v/slow_tests/inout/struct_field_option.out
new file mode 100644
index 000000000..eb650f4af
--- /dev/null
+++ b/vlib/v/slow_tests/inout/struct_field_option.out
@@ -0,0 +1,26 @@
+1
+[vlib/v/slow_tests/inout/struct_field_option.vv:15] f.bar?: 1
+2
+[vlib/v/slow_tests/inout/struct_field_option.vv:22] f.bar?: 2
+3
+[vlib/v/slow_tests/inout/struct_field_option.vv:26] f.bar?: 3
+3
+[vlib/v/slow_tests/inout/struct_field_option.vv:30] a: 3
+9999
+[vlib/v/slow_tests/inout/struct_field_option.vv:33] b: 9999
+4
+[vlib/v/slow_tests/inout/struct_field_option.vv:37] sum: 4
+4
+[vlib/v/slow_tests/inout/struct_field_option.vv:40] sum: 4
+3
+none
+3
+Foo{
+    bar: 3
+    baz: 0
+}
+[vlib/v/slow_tests/inout/struct_field_option.vv:61] f: Foo{
+    bar: 3
+    baz: 0
+}
+1
\ No newline at end of file
diff --git a/vlib/v/tests/inout/struct_field_option.vv b/vlib/v/slow_tests/inout/struct_field_option.vv
similarity index 100%
rename from vlib/v/tests/inout/struct_field_option.vv
rename to vlib/v/slow_tests/inout/struct_field_option.vv
diff --git a/vlib/v/tests/inout/sumtype_with_fntype.out b/vlib/v/slow_tests/inout/sumtype_with_fntype.out
similarity index 100%
rename from vlib/v/tests/inout/sumtype_with_fntype.out
rename to vlib/v/slow_tests/inout/sumtype_with_fntype.out
diff --git a/vlib/v/tests/inout/sumtype_with_fntype.vv b/vlib/v/slow_tests/inout/sumtype_with_fntype.vv
similarity index 100%
rename from vlib/v/tests/inout/sumtype_with_fntype.vv
rename to vlib/v/slow_tests/inout/sumtype_with_fntype.vv
diff --git a/vlib/v/tests/inout/tmpl_all_in_one_folder.out b/vlib/v/slow_tests/inout/tmpl_all_in_one_folder.out
similarity index 100%
rename from vlib/v/tests/inout/tmpl_all_in_one_folder.out
rename to vlib/v/slow_tests/inout/tmpl_all_in_one_folder.out
diff --git a/vlib/v/tests/inout/tmpl_all_in_one_folder.vv b/vlib/v/slow_tests/inout/tmpl_all_in_one_folder.vv
similarity index 100%
rename from vlib/v/tests/inout/tmpl_all_in_one_folder.vv
rename to vlib/v/slow_tests/inout/tmpl_all_in_one_folder.vv
diff --git a/vlib/v/tests/inout/tmpl_expand_v_source_code.out b/vlib/v/slow_tests/inout/tmpl_expand_v_source_code.out
similarity index 100%
rename from vlib/v/tests/inout/tmpl_expand_v_source_code.out
rename to vlib/v/slow_tests/inout/tmpl_expand_v_source_code.out
diff --git a/vlib/v/slow_tests/inout/tmpl_expand_v_source_code.vv b/vlib/v/slow_tests/inout/tmpl_expand_v_source_code.vv
new file mode 100644
index 000000000..8d21590d5
--- /dev/null
+++ b/vlib/v/slow_tests/inout/tmpl_expand_v_source_code.vv
@@ -0,0 +1,17 @@
+module main
+
+const codepath_file = @FILE
+
+fn main() {
+	togenerate := ['user', 'circle']
+	for name in togenerate {
+		object := name
+		object_u := name.capitalize()
+		objects := name + 's'
+		objects_u := name.capitalize() + 's'
+		mut txt := $tmpl('data_obj.v.templ')
+		txt = txt.replace('/////////// THIS IS THE TEMPLATE, THIS CAN BE MODIFIED', '')
+		println(txt)
+	}
+	println('OK')
+}
diff --git a/vlib/v/tests/inout/tmpl_parse_html.out b/vlib/v/slow_tests/inout/tmpl_parse_html.out
similarity index 100%
rename from vlib/v/tests/inout/tmpl_parse_html.out
rename to vlib/v/slow_tests/inout/tmpl_parse_html.out
diff --git a/vlib/v/tests/inout/tmpl_parse_html.vv b/vlib/v/slow_tests/inout/tmpl_parse_html.vv
similarity index 100%
rename from vlib/v/tests/inout/tmpl_parse_html.vv
rename to vlib/v/slow_tests/inout/tmpl_parse_html.vv
diff --git a/vlib/v/tests/inout/vscript_using_generics_in_os.out b/vlib/v/slow_tests/inout/vscript_using_generics_in_os.out
similarity index 100%
rename from vlib/v/tests/inout/vscript_using_generics_in_os.out
rename to vlib/v/slow_tests/inout/vscript_using_generics_in_os.out
diff --git a/vlib/v/tests/inout/vscript_using_generics_in_os.vsh b/vlib/v/slow_tests/inout/vscript_using_generics_in_os.vsh
similarity index 100%
rename from vlib/v/tests/inout/vscript_using_generics_in_os.vsh
rename to vlib/v/slow_tests/inout/vscript_using_generics_in_os.vsh
diff --git a/vlib/v/tests/keep_args_alive_test.v b/vlib/v/slow_tests/keep_args_alive_test.v
similarity index 97%
rename from vlib/v/tests/keep_args_alive_test.v
rename to vlib/v/slow_tests/keep_args_alive_test.v
index b8a53e8bb..4eda9e8d0 100644
--- a/vlib/v/tests/keep_args_alive_test.v
+++ b/vlib/v/slow_tests/keep_args_alive_test.v
@@ -11,7 +11,7 @@
 import rand
 import sync
 
-#flag -I@VEXEROOT/vlib/v/tests
+#flag -I@VEXEROOT/vlib/v/slow_tests
 #include "keep_args_alive_test_c.h"
 
 fn C.atomic_load_ptr(voidptr) voidptr
diff --git a/vlib/v/tests/keep_args_alive_test_c.h b/vlib/v/slow_tests/keep_args_alive_test_c.h
similarity index 100%
rename from vlib/v/tests/keep_args_alive_test_c.h
rename to vlib/v/slow_tests/keep_args_alive_test_c.h
diff --git a/vlib/v/tests/modules/acommentedmodule/commentedfile.v b/vlib/v/slow_tests/modules/acommentedmodule/commentedfile.v
similarity index 100%
rename from vlib/v/tests/modules/acommentedmodule/commentedfile.v
rename to vlib/v/slow_tests/modules/acommentedmodule/commentedfile.v
diff --git a/vlib/v/tests/prod/.gitignore b/vlib/v/slow_tests/prod/.gitignore
similarity index 100%
rename from vlib/v/tests/prod/.gitignore
rename to vlib/v/slow_tests/prod/.gitignore
diff --git a/vlib/v/tests/prod/asserts_should_be_skipped.prod.v b/vlib/v/slow_tests/prod/asserts_should_be_skipped.prod.v
similarity index 100%
rename from vlib/v/tests/prod/asserts_should_be_skipped.prod.v
rename to vlib/v/slow_tests/prod/asserts_should_be_skipped.prod.v
diff --git a/vlib/v/tests/prod/asserts_should_be_skipped.prod.v.expected.txt b/vlib/v/slow_tests/prod/asserts_should_be_skipped.prod.v.expected.txt
similarity index 100%
rename from vlib/v/tests/prod/asserts_should_be_skipped.prod.v.expected.txt
rename to vlib/v/slow_tests/prod/asserts_should_be_skipped.prod.v.expected.txt
diff --git a/vlib/v/tests/prod/assoc.prod.v b/vlib/v/slow_tests/prod/assoc.prod.v
similarity index 100%
rename from vlib/v/tests/prod/assoc.prod.v
rename to vlib/v/slow_tests/prod/assoc.prod.v
diff --git a/vlib/v/tests/prod/assoc.prod.v.expected.txt b/vlib/v/slow_tests/prod/assoc.prod.v.expected.txt
similarity index 100%
rename from vlib/v/tests/prod/assoc.prod.v.expected.txt
rename to vlib/v/slow_tests/prod/assoc.prod.v.expected.txt
diff --git a/vlib/v/tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v b/vlib/v/slow_tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v
similarity index 100%
rename from vlib/v/tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v
rename to vlib/v/slow_tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v
diff --git a/vlib/v/tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v.expected.txt b/vlib/v/slow_tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v.expected.txt
similarity index 100%
rename from vlib/v/tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v.expected.txt
rename to vlib/v/slow_tests/prod/f64_literals_and_simple_expressions_should_not_round_as_f32.prod.v.expected.txt
diff --git a/vlib/v/tests/prod_test.v b/vlib/v/slow_tests/prod_test.v
similarity index 95%
rename from vlib/v/tests/prod_test.v
rename to vlib/v/slow_tests/prod_test.v
index 0b67fa451..3037d4c7f 100644
--- a/vlib/v/tests/prod_test.v
+++ b/vlib/v/slow_tests/prod_test.v
@@ -1,6 +1,6 @@
 // Build and run files in ./prod/ folder, comparing their output to *.expected.txt files.
 // (Similar to REPL tests, but in -prod mode.)
-import v.tests.repl.runner
+import v.slow_tests.repl.runner
 import benchmark
 
 fn test_all_v_prod_files() {
diff --git a/vlib/v/tests/profile/profile_test.v b/vlib/v/slow_tests/profile/profile_test.v
similarity index 92%
rename from vlib/v/tests/profile/profile_test.v
rename to vlib/v/slow_tests/profile/profile_test.v
index c67d350fe..5ed2df9ac 100644
--- a/vlib/v/tests/profile/profile_test.v
+++ b/vlib/v/slow_tests/profile/profile_test.v
@@ -10,7 +10,7 @@ fn test_vexe_exists() {
 }
 
 fn test_v_profile_works() {
-	sfile := 'vlib/v/tests/profile/profile_test_1.v'
+	sfile := 'vlib/v/slow_tests/profile/profile_test_1.v'
 	validate_output(@FN, '', sfile, {
 		'os__init_os_args': 1
 		'main__main':       1
@@ -20,7 +20,7 @@ fn test_v_profile_works() {
 }
 
 fn test_v_profile_on_off_api_works() {
-	sfile := 'vlib/v/tests/profile/profile_test_2.v'
+	sfile := 'vlib/v/slow_tests/profile/profile_test_2.v'
 	res_lines := validate_output(@FN, '', sfile, {
 		'builtin_init': 1
 		'main__main':   1
@@ -37,7 +37,7 @@ fn test_v_profile_on_off_api_works() {
 }
 
 fn test_v_profile_fns_option_works() {
-	sfile := 'vlib/v/tests/profile/profile_test_3.v'
+	sfile := 'vlib/v/slow_tests/profile/profile_test_3.v'
 	validate_output(@FN, '-profile-fns println', sfile, {
 		'main__main': -1
 		'main__abc':  -1
diff --git a/vlib/v/tests/profile/profile_test_1.v b/vlib/v/slow_tests/profile/profile_test_1.v
similarity index 100%
rename from vlib/v/tests/profile/profile_test_1.v
rename to vlib/v/slow_tests/profile/profile_test_1.v
diff --git a/vlib/v/tests/profile/profile_test_2.v b/vlib/v/slow_tests/profile/profile_test_2.v
similarity index 100%
rename from vlib/v/tests/profile/profile_test_2.v
rename to vlib/v/slow_tests/profile/profile_test_2.v
diff --git a/vlib/v/tests/profile/profile_test_3.v b/vlib/v/slow_tests/profile/profile_test_3.v
similarity index 100%
rename from vlib/v/tests/profile/profile_test_3.v
rename to vlib/v/slow_tests/profile/profile_test_3.v
diff --git a/vlib/v/tests/repl/.gitattributes b/vlib/v/slow_tests/repl/.gitattributes
similarity index 100%
rename from vlib/v/tests/repl/.gitattributes
rename to vlib/v/slow_tests/repl/.gitattributes
diff --git a/vlib/v/tests/repl/.gitignore b/vlib/v/slow_tests/repl/.gitignore
similarity index 100%
rename from vlib/v/tests/repl/.gitignore
rename to vlib/v/slow_tests/repl/.gitignore
diff --git a/vlib/v/tests/repl/README.md b/vlib/v/slow_tests/repl/README.md
similarity index 100%
rename from vlib/v/tests/repl/README.md
rename to vlib/v/slow_tests/repl/README.md
diff --git a/vlib/v/tests/repl/array_filter.repl b/vlib/v/slow_tests/repl/array_filter.repl
similarity index 100%
rename from vlib/v/tests/repl/array_filter.repl
rename to vlib/v/slow_tests/repl/array_filter.repl
diff --git a/vlib/v/tests/repl/array_init.repl b/vlib/v/slow_tests/repl/array_init.repl
similarity index 100%
rename from vlib/v/tests/repl/array_init.repl
rename to vlib/v/slow_tests/repl/array_init.repl
diff --git a/vlib/v/tests/repl/array_method.repl b/vlib/v/slow_tests/repl/array_method.repl
similarity index 100%
rename from vlib/v/tests/repl/array_method.repl
rename to vlib/v/slow_tests/repl/array_method.repl
diff --git a/vlib/v/tests/repl/bad_in_type.repl.skip b/vlib/v/slow_tests/repl/bad_in_type.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/bad_in_type.repl.skip
rename to vlib/v/slow_tests/repl/bad_in_type.repl.skip
diff --git a/vlib/v/tests/repl/chained_fields/bd.repl.skip b/vlib/v/slow_tests/repl/chained_fields/bd.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/chained_fields/bd.repl.skip
rename to vlib/v/slow_tests/repl/chained_fields/bd.repl.skip
diff --git a/vlib/v/tests/repl/chained_fields/c.repl.skip b/vlib/v/slow_tests/repl/chained_fields/c.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/chained_fields/c.repl.skip
rename to vlib/v/slow_tests/repl/chained_fields/c.repl.skip
diff --git a/vlib/v/tests/repl/chained_fields/c2.repl.skip b/vlib/v/slow_tests/repl/chained_fields/c2.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/chained_fields/c2.repl.skip
rename to vlib/v/slow_tests/repl/chained_fields/c2.repl.skip
diff --git a/vlib/v/tests/repl/chained_fields/d.repl.skip b/vlib/v/slow_tests/repl/chained_fields/d.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/chained_fields/d.repl.skip
rename to vlib/v/slow_tests/repl/chained_fields/d.repl.skip
diff --git a/vlib/v/tests/repl/chained_fields/ef.repl.skip b/vlib/v/slow_tests/repl/chained_fields/ef.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/chained_fields/ef.repl.skip
rename to vlib/v/slow_tests/repl/chained_fields/ef.repl.skip
diff --git a/vlib/v/tests/repl/comptime_tmpl.repl b/vlib/v/slow_tests/repl/comptime_tmpl.repl
similarity index 100%
rename from vlib/v/tests/repl/comptime_tmpl.repl
rename to vlib/v/slow_tests/repl/comptime_tmpl.repl
diff --git a/vlib/v/tests/repl/conditional_blocks/for.repl b/vlib/v/slow_tests/repl/conditional_blocks/for.repl
similarity index 100%
rename from vlib/v/tests/repl/conditional_blocks/for.repl
rename to vlib/v/slow_tests/repl/conditional_blocks/for.repl
diff --git a/vlib/v/tests/repl/conditional_blocks/if.repl b/vlib/v/slow_tests/repl/conditional_blocks/if.repl
similarity index 100%
rename from vlib/v/tests/repl/conditional_blocks/if.repl
rename to vlib/v/slow_tests/repl/conditional_blocks/if.repl
diff --git a/vlib/v/tests/repl/conditional_blocks/if_else.repl b/vlib/v/slow_tests/repl/conditional_blocks/if_else.repl
similarity index 100%
rename from vlib/v/tests/repl/conditional_blocks/if_else.repl
rename to vlib/v/slow_tests/repl/conditional_blocks/if_else.repl
diff --git a/vlib/v/tests/repl/default_printing.repl b/vlib/v/slow_tests/repl/default_printing.repl
similarity index 100%
rename from vlib/v/tests/repl/default_printing.repl
rename to vlib/v/slow_tests/repl/default_printing.repl
diff --git a/vlib/v/tests/repl/empty_struct.repl.skip b/vlib/v/slow_tests/repl/empty_struct.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/empty_struct.repl.skip
rename to vlib/v/slow_tests/repl/empty_struct.repl.skip
diff --git a/vlib/v/slow_tests/repl/entire_commented_module.repl b/vlib/v/slow_tests/repl/entire_commented_module.repl
new file mode 100644
index 000000000..96dae9441
--- /dev/null
+++ b/vlib/v/slow_tests/repl/entire_commented_module.repl
@@ -0,0 +1,7 @@
+import v.slow_tests.modules.acommentedmodule
+===output===
+builder error: bad module definition: .entire_commented_module.repl.vrepl_temp.v imports module "v.slow_tests.modules.acommentedmodule" but vlib/v/slow_tests/modules/acommentedmodule/commentedfile.v is defined as module `main`
+    1 | import v.slow_tests.modules.acommentedmodule
+      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    2 | import os
+    3 |
diff --git a/vlib/v/tests/repl/error.repl b/vlib/v/slow_tests/repl/error.repl
similarity index 100%
rename from vlib/v/tests/repl/error.repl
rename to vlib/v/slow_tests/repl/error.repl
diff --git a/vlib/v/tests/repl/error_and_continue_print.repl b/vlib/v/slow_tests/repl/error_and_continue_print.repl
similarity index 100%
rename from vlib/v/tests/repl/error_and_continue_print.repl
rename to vlib/v/slow_tests/repl/error_and_continue_print.repl
diff --git a/vlib/v/tests/repl/error_exitasdfasdf.repl b/vlib/v/slow_tests/repl/error_exitasdfasdf.repl
similarity index 100%
rename from vlib/v/tests/repl/error_exitasdfasdf.repl
rename to vlib/v/slow_tests/repl/error_exitasdfasdf.repl
diff --git a/vlib/v/tests/repl/error_nosave.repl.skip b/vlib/v/slow_tests/repl/error_nosave.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/error_nosave.repl.skip
rename to vlib/v/slow_tests/repl/error_nosave.repl.skip
diff --git a/vlib/v/tests/repl/fn_calls.repl b/vlib/v/slow_tests/repl/fn_calls.repl
similarity index 100%
rename from vlib/v/tests/repl/fn_calls.repl
rename to vlib/v/slow_tests/repl/fn_calls.repl
diff --git a/vlib/v/tests/repl/function.repl.skip b/vlib/v/slow_tests/repl/function.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/function.repl.skip
rename to vlib/v/slow_tests/repl/function.repl.skip
diff --git a/vlib/v/tests/repl/immutable_len_fields/fields.1.repl.skip b/vlib/v/slow_tests/repl/immutable_len_fields/fields.1.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/immutable_len_fields/fields.1.repl.skip
rename to vlib/v/slow_tests/repl/immutable_len_fields/fields.1.repl.skip
diff --git a/vlib/v/tests/repl/immutable_len_fields/fields.2.repl.skip b/vlib/v/slow_tests/repl/immutable_len_fields/fields.2.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/immutable_len_fields/fields.2.repl.skip
rename to vlib/v/slow_tests/repl/immutable_len_fields/fields.2.repl.skip
diff --git a/vlib/v/tests/repl/immutable_len_fields/fields.3.repl.skip b/vlib/v/slow_tests/repl/immutable_len_fields/fields.3.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/immutable_len_fields/fields.3.repl.skip
rename to vlib/v/slow_tests/repl/immutable_len_fields/fields.3.repl.skip
diff --git a/vlib/v/tests/repl/import.repl b/vlib/v/slow_tests/repl/import.repl
similarity index 100%
rename from vlib/v/tests/repl/import.repl
rename to vlib/v/slow_tests/repl/import.repl
diff --git a/vlib/v/tests/repl/import_alias.repl b/vlib/v/slow_tests/repl/import_alias.repl
similarity index 100%
rename from vlib/v/tests/repl/import_alias.repl
rename to vlib/v/slow_tests/repl/import_alias.repl
diff --git a/vlib/v/tests/repl/naked_strings.repl b/vlib/v/slow_tests/repl/naked_strings.repl
similarity index 100%
rename from vlib/v/tests/repl/naked_strings.repl
rename to vlib/v/slow_tests/repl/naked_strings.repl
diff --git a/vlib/v/tests/repl/newlines.repl b/vlib/v/slow_tests/repl/newlines.repl
similarity index 100%
rename from vlib/v/tests/repl/newlines.repl
rename to vlib/v/slow_tests/repl/newlines.repl
diff --git a/vlib/v/tests/repl/nomain.repl b/vlib/v/slow_tests/repl/nomain.repl
similarity index 100%
rename from vlib/v/tests/repl/nomain.repl
rename to vlib/v/slow_tests/repl/nomain.repl
diff --git a/vlib/v/tests/repl/nothing.repl b/vlib/v/slow_tests/repl/nothing.repl
similarity index 100%
rename from vlib/v/tests/repl/nothing.repl
rename to vlib/v/slow_tests/repl/nothing.repl
diff --git a/vlib/v/tests/repl/open_close_string_check.repl b/vlib/v/slow_tests/repl/open_close_string_check.repl
similarity index 100%
rename from vlib/v/tests/repl/open_close_string_check.repl
rename to vlib/v/slow_tests/repl/open_close_string_check.repl
diff --git a/vlib/v/tests/repl/option.repl.skip b/vlib/v/slow_tests/repl/option.repl.skip
similarity index 100%
rename from vlib/v/tests/repl/option.repl.skip
rename to vlib/v/slow_tests/repl/option.repl.skip
diff --git a/vlib/v/tests/repl/option_call.repl b/vlib/v/slow_tests/repl/option_call.repl
similarity index 100%
rename from vlib/v/tests/repl/option_call.repl
rename to vlib/v/slow_tests/repl/option_call.repl
diff --git a/vlib/v/tests/repl/postfix_operators.repl b/vlib/v/slow_tests/repl/postfix_operators.repl
similarity index 100%
rename from vlib/v/tests/repl/postfix_operators.repl
rename to vlib/v/slow_tests/repl/postfix_operators.repl
diff --git a/vlib/v/tests/repl/print_and_fn_call.repl b/vlib/v/slow_tests/repl/print_and_fn_call.repl
similarity index 100%
rename from vlib/v/tests/repl/print_and_fn_call.repl
rename to vlib/v/slow_tests/repl/print_and_fn_call.repl
diff --git a/vlib/v/tests/repl/println.repl b/vlib/v/slow_tests/repl/println.repl
similarity index 100%
rename from vlib/v/tests/repl/println.repl
rename to vlib/v/slow_tests/repl/println.repl
diff --git a/vlib/v/tests/repl/repl_test.v b/vlib/v/slow_tests/repl/repl_test.v
similarity index 93%
rename from vlib/v/tests/repl/repl_test.v
rename to vlib/v/slow_tests/repl/repl_test.v
index b072d31fc..2b54a61c4 100644
--- a/vlib/v/tests/repl/repl_test.v
+++ b/vlib/v/slow_tests/repl/repl_test.v
@@ -1,7 +1,7 @@
 module main
 
 import os
-import v.tests.repl.runner
+import v.slow_tests.repl.runner
 import benchmark
 import sync.pool
 
@@ -46,7 +46,7 @@ fn test_all_v_repl_files() {
 		bmark: benchmark.new_benchmark()
 	}
 	// warmup, and ensure that the vrepl is compiled in single threaded mode if it does not exist
-	runner.run_repl_file(os.cache_dir(), session.options.vexec, 'vlib/v/tests/repl/nothing.repl') or {
+	runner.run_repl_file(os.cache_dir(), session.options.vexec, 'vlib/v/slow_tests/repl/nothing.repl') or {
 		panic(err)
 	}
 	session.bmark.set_total_expected_steps(session.options.files.len)
@@ -63,8 +63,8 @@ fn test_all_v_repl_files() {
 
 fn worker_repl(mut p pool.PoolProcessor, idx int, thread_id int) voidptr {
 	cdir := os.cache_dir()
-	mut session := &Session(p.get_shared_context())
-	mut tls_bench := &benchmark.Benchmark(p.get_thread_context(idx))
+	mut session := unsafe { &Session(p.get_shared_context()) }
+	mut tls_bench := unsafe { &benchmark.Benchmark(p.get_thread_context(idx)) }
 	if isnil(tls_bench) {
 		tls_bench = benchmark.new_benchmark_pointer()
 		tls_bench.set_total_expected_steps(session.bmark.nexpected_steps)
diff --git a/vlib/v/tests/repl/runner/runner.v b/vlib/v/slow_tests/repl/runner/runner.v
similarity index 97%
rename from vlib/v/tests/repl/runner/runner.v
rename to vlib/v/slow_tests/repl/runner/runner.v
index 18298e1cc..5ee7dff74 100644
--- a/vlib/v/tests/repl/runner/runner.v
+++ b/vlib/v/slow_tests/repl/runner/runner.v
@@ -49,7 +49,7 @@ pub fn run_repl_file(wd string, vexec string, file string) !string {
 	input_temporary_filename := os.real_path(os.join_path(wd, 'input_temporary_filename.txt'))
 	os.write_file(input_temporary_filename, input) or { panic(err) }
 	os.write_file(os.real_path(os.join_path(wd, 'original.txt')), fcontent) or { panic(err) }
-	os.cp_all('vlib/v/tests/repl/tmpl', os.real_path(os.join_path(wd, 'tmpl')), true) or {
+	os.cp_all('vlib/v/slow_tests/repl/tmpl', os.real_path(os.join_path(wd, 'tmpl')), true) or {
 		panic(err)
 	}
 	rcmd := '${os.quoted_path(vexec)} repl -replfolder ${os.quoted_path(wd)} -replprefix "${fname}." < ${os.quoted_path(input_temporary_filename)}'
diff --git a/vlib/v/tests/repl/tmpl/hello.txt b/vlib/v/slow_tests/repl/tmpl/hello.txt
similarity index 100%
rename from vlib/v/tests/repl/tmpl/hello.txt
rename to vlib/v/slow_tests/repl/tmpl/hello.txt
diff --git a/vlib/v/tests/repl/var_decl.repl b/vlib/v/slow_tests/repl/var_decl.repl
similarity index 100%
rename from vlib/v/tests/repl/var_decl.repl
rename to vlib/v/slow_tests/repl/var_decl.repl
diff --git a/vlib/v/tests/repl/void_vlib_fncall.repl b/vlib/v/slow_tests/repl/void_vlib_fncall.repl
similarity index 100%
rename from vlib/v/tests/repl/void_vlib_fncall.repl
rename to vlib/v/slow_tests/repl/void_vlib_fncall.repl
diff --git a/vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f1.v b/vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f1.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f1.v
rename to vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f1.v
diff --git a/vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f2.v b/vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f2.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f2.v
rename to vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/f2.v
diff --git a/vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/main.v b/vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/main.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/main.v
rename to vlib/v/slow_tests/run_project_folders/go_fns_in_different_files_over_the_same_struct/main.v
diff --git a/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v b/vlib/v/slow_tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v
rename to vlib/v/slow_tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/a.v
diff --git a/vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v b/vlib/v/slow_tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v
rename to vlib/v/slow_tests/run_project_folders/issue_10023_multiple_anon_fns_with_same_position/b.v
diff --git a/vlib/v/tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/any_test.v b/vlib/v/slow_tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/any_test.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/any_test.v
rename to vlib/v/slow_tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/any_test.v
diff --git a/vlib/v/tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/main.v b/vlib/v/slow_tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/main.v
similarity index 100%
rename from vlib/v/tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/main.v
rename to vlib/v/slow_tests/run_project_folders/issue_13443_test_prefixed_fns_in_normal_v_files/main.v
diff --git a/vlib/v/tests/run_project_folders_test.v b/vlib/v/slow_tests/run_project_folders_test.v
similarity index 88%
rename from vlib/v/tests/run_project_folders_test.v
rename to vlib/v/slow_tests/run_project_folders_test.v
index 7347efaa9..5c69588fe 100644
--- a/vlib/v/tests/run_project_folders_test.v
+++ b/vlib/v/slow_tests/run_project_folders_test.v
@@ -13,8 +13,8 @@ fn test_vexe_exists() {
 
 fn test_v_profile_works() {
 	os.chdir(vroot) or {}
-	folders_root := os.join_path(vroot, 'vlib/v/tests/run_project_folders')
-	folder_names := os.ls(folders_root)?
+	folders_root := os.join_path(vroot, 'vlib/v/slow_tests/run_project_folders')
+	folder_names := os.ls(folders_root)!
 	mut folder_paths := []string{}
 	for fname in folder_names {
 		folder_path := os.join_path(folders_root, fname)
diff --git a/vlib/v/tests/valgrind/1.strings_and_arrays.v b/vlib/v/slow_tests/valgrind/1.strings_and_arrays.v
similarity index 100%
rename from vlib/v/tests/valgrind/1.strings_and_arrays.v
rename to vlib/v/slow_tests/valgrind/1.strings_and_arrays.v
diff --git a/vlib/v/tests/valgrind/2.heap_objects.v b/vlib/v/slow_tests/valgrind/2.heap_objects.v
similarity index 100%
rename from vlib/v/tests/valgrind/2.heap_objects.v
rename to vlib/v/slow_tests/valgrind/2.heap_objects.v
diff --git a/vlib/v/tests/valgrind/array_init_with_string_variable.v b/vlib/v/slow_tests/valgrind/array_init_with_string_variable.v
similarity index 100%
rename from vlib/v/tests/valgrind/array_init_with_string_variable.v
rename to vlib/v/slow_tests/valgrind/array_init_with_string_variable.v
diff --git a/vlib/v/tests/valgrind/base64.v b/vlib/v/slow_tests/valgrind/base64.v
similarity index 100%
rename from vlib/v/tests/valgrind/base64.v
rename to vlib/v/slow_tests/valgrind/base64.v
diff --git a/vlib/v/tests/valgrind/buffer_passed_in_fn_that_uses_tos_on_it.v b/vlib/v/slow_tests/valgrind/buffer_passed_in_fn_that_uses_tos_on_it.v
similarity index 100%
rename from vlib/v/tests/valgrind/buffer_passed_in_fn_that_uses_tos_on_it.v
rename to vlib/v/slow_tests/valgrind/buffer_passed_in_fn_that_uses_tos_on_it.v
diff --git a/vlib/v/tests/valgrind/dump_nested_structs.v b/vlib/v/slow_tests/valgrind/dump_nested_structs.v
similarity index 100%
rename from vlib/v/tests/valgrind/dump_nested_structs.v
rename to vlib/v/slow_tests/valgrind/dump_nested_structs.v
diff --git a/vlib/v/tests/valgrind/fn_returning_string_param.v b/vlib/v/slow_tests/valgrind/fn_returning_string_param.v
similarity index 100%
rename from vlib/v/tests/valgrind/fn_returning_string_param.v
rename to vlib/v/slow_tests/valgrind/fn_returning_string_param.v
diff --git a/vlib/v/tests/valgrind/fn_with_return_should_free_local_vars.v b/vlib/v/slow_tests/valgrind/fn_with_return_should_free_local_vars.v
similarity index 100%
rename from vlib/v/tests/valgrind/fn_with_return_should_free_local_vars.v
rename to vlib/v/slow_tests/valgrind/fn_with_return_should_free_local_vars.v
diff --git a/vlib/v/tests/valgrind/free_heap_foos.v b/vlib/v/slow_tests/valgrind/free_heap_foos.v
similarity index 100%
rename from vlib/v/tests/valgrind/free_heap_foos.v
rename to vlib/v/slow_tests/valgrind/free_heap_foos.v
diff --git a/vlib/v/tests/valgrind/free_variables_in_reverse_order_of_creation.v b/vlib/v/slow_tests/valgrind/free_variables_in_reverse_order_of_creation.v
similarity index 100%
rename from vlib/v/tests/valgrind/free_variables_in_reverse_order_of_creation.v
rename to vlib/v/slow_tests/valgrind/free_variables_in_reverse_order_of_creation.v
diff --git a/vlib/v/tests/valgrind/if_expr.v b/vlib/v/slow_tests/valgrind/if_expr.v
similarity index 100%
rename from vlib/v/tests/valgrind/if_expr.v
rename to vlib/v/slow_tests/valgrind/if_expr.v
diff --git a/vlib/v/tests/valgrind/if_expr_skip.v b/vlib/v/slow_tests/valgrind/if_expr_skip.v
similarity index 100%
rename from vlib/v/tests/valgrind/if_expr_skip.v
rename to vlib/v/slow_tests/valgrind/if_expr_skip.v
diff --git a/vlib/v/tests/valgrind/import_os_and_use_its_constants.v b/vlib/v/slow_tests/valgrind/import_os_and_use_its_constants.v
similarity index 100%
rename from vlib/v/tests/valgrind/import_os_and_use_its_constants.v
rename to vlib/v/slow_tests/valgrind/import_os_and_use_its_constants.v
diff --git a/vlib/v/tests/valgrind/import_x_json2.v b/vlib/v/slow_tests/valgrind/import_x_json2.v
similarity index 100%
rename from vlib/v/tests/valgrind/import_x_json2.v
rename to vlib/v/slow_tests/valgrind/import_x_json2.v
diff --git a/vlib/v/tests/valgrind/logging.v b/vlib/v/slow_tests/valgrind/logging.v
similarity index 100%
rename from vlib/v/tests/valgrind/logging.v
rename to vlib/v/slow_tests/valgrind/logging.v
diff --git a/vlib/v/tests/valgrind/option_reassigned.v b/vlib/v/slow_tests/valgrind/option_reassigned.v
similarity index 100%
rename from vlib/v/tests/valgrind/option_reassigned.v
rename to vlib/v/slow_tests/valgrind/option_reassigned.v
diff --git a/vlib/v/tests/valgrind/option_simple.v b/vlib/v/slow_tests/valgrind/option_simple.v
similarity index 100%
rename from vlib/v/tests/valgrind/option_simple.v
rename to vlib/v/slow_tests/valgrind/option_simple.v
diff --git a/vlib/v/tests/valgrind/rand_module.v b/vlib/v/slow_tests/valgrind/rand_module.v
similarity index 100%
rename from vlib/v/tests/valgrind/rand_module.v
rename to vlib/v/slow_tests/valgrind/rand_module.v
diff --git a/vlib/v/tests/valgrind/rune_methods.v b/vlib/v/slow_tests/valgrind/rune_methods.v
similarity index 100%
rename from vlib/v/tests/valgrind/rune_methods.v
rename to vlib/v/slow_tests/valgrind/rune_methods.v
diff --git a/vlib/v/tests/valgrind/simple_interpolation.v b/vlib/v/slow_tests/valgrind/simple_interpolation.v
similarity index 100%
rename from vlib/v/tests/valgrind/simple_interpolation.v
rename to vlib/v/slow_tests/valgrind/simple_interpolation.v
diff --git a/vlib/v/tests/valgrind/simple_interpolation_script_mode.v b/vlib/v/slow_tests/valgrind/simple_interpolation_script_mode.v
similarity index 100%
rename from vlib/v/tests/valgrind/simple_interpolation_script_mode.v
rename to vlib/v/slow_tests/valgrind/simple_interpolation_script_mode.v
diff --git a/vlib/v/tests/valgrind/simple_interpolation_script_mode_more_scopes.v b/vlib/v/slow_tests/valgrind/simple_interpolation_script_mode_more_scopes.v
similarity index 100%
rename from vlib/v/tests/valgrind/simple_interpolation_script_mode_more_scopes.v
rename to vlib/v/slow_tests/valgrind/simple_interpolation_script_mode_more_scopes.v
diff --git a/vlib/v/tests/valgrind/string_plus_string_plus.v b/vlib/v/slow_tests/valgrind/string_plus_string_plus.v
similarity index 100%
rename from vlib/v/tests/valgrind/string_plus_string_plus.v
rename to vlib/v/slow_tests/valgrind/string_plus_string_plus.v
diff --git a/vlib/v/tests/valgrind/string_str_method.v b/vlib/v/slow_tests/valgrind/string_str_method.v
similarity index 100%
rename from vlib/v/tests/valgrind/string_str_method.v
rename to vlib/v/slow_tests/valgrind/string_str_method.v
diff --git a/vlib/v/tests/valgrind/strings_builder.v b/vlib/v/slow_tests/valgrind/strings_builder.v
similarity index 100%
rename from vlib/v/tests/valgrind/strings_builder.v
rename to vlib/v/slow_tests/valgrind/strings_builder.v
diff --git a/vlib/v/tests/valgrind/struct_field.v b/vlib/v/slow_tests/valgrind/struct_field.v
similarity index 100%
rename from vlib/v/tests/valgrind/struct_field.v
rename to vlib/v/slow_tests/valgrind/struct_field.v
diff --git a/vlib/v/tests/valgrind/struct_of_array_of_same_struct.v b/vlib/v/slow_tests/valgrind/struct_of_array_of_same_struct.v
similarity index 100%
rename from vlib/v/tests/valgrind/struct_of_array_of_same_struct.v
rename to vlib/v/slow_tests/valgrind/struct_of_array_of_same_struct.v
diff --git a/vlib/v/tests/valgrind/valgrind_test.v b/vlib/v/slow_tests/valgrind/valgrind_test.v
similarity index 82%
rename from vlib/v/tests/valgrind/valgrind_test.v
rename to vlib/v/slow_tests/valgrind/valgrind_test.v
index 24307240a..ca1205ad2 100644
--- a/vlib/v/tests/valgrind/valgrind_test.v
+++ b/vlib/v/slow_tests/valgrind/valgrind_test.v
@@ -14,22 +14,22 @@ fn bold(s string) string {
 // .v files in skip_valgrind_files will be compiled, but will not be run under
 // valgrind. This ensures that at least the generated code does not have C syntax
 // errors.
-// Use: `./v -d noskipcompile vlib/v/tests/valgrind/valgrind_test.v` to ignore the
+// Use: `./v -d noskipcompile vlib/v/slow_tests/valgrind/valgrind_test.v` to ignore the
 // skip_compile_files list.
-// Use: `./v -d noskip vlib/v/tests/valgrind/valgrind_test.v` to ignore skip_valgrind_files
-// Use: `./v -d noskipcompile -d noskip vlib/v/tests/valgrind/valgrind_test.v` to ignore both
+// Use: `./v -d noskip vlib/v/slow_tests/valgrind/valgrind_test.v` to ignore skip_valgrind_files
+// Use: `./v -d noskipcompile -d noskip vlib/v/slow_tests/valgrind/valgrind_test.v` to ignore both
 //
 const skip_compile_files = [
-	'vlib/v/tests/valgrind/option_reassigned.v',
+	'vlib/v/slow_tests/valgrind/option_reassigned.v',
 ]
 
 const skip_valgrind_files = [
-	'vlib/v/tests/valgrind/struct_field.v',
-	'vlib/v/tests/valgrind/fn_returning_string_param.v',
-	'vlib/v/tests/valgrind/fn_with_return_should_free_local_vars.v',
-	'vlib/v/tests/valgrind/option_simple.v',
-	'vlib/v/tests/valgrind/string_plus_string_plus.v',
-	'vlib/v/tests/valgrind/import_x_json2.v',
+	'vlib/v/slow_tests/valgrind/struct_field.v',
+	'vlib/v/slow_tests/valgrind/fn_returning_string_param.v',
+	'vlib/v/slow_tests/valgrind/fn_with_return_should_free_local_vars.v',
+	'vlib/v/slow_tests/valgrind/option_simple.v',
+	'vlib/v/slow_tests/valgrind/string_plus_string_plus.v',
+	'vlib/v/slow_tests/valgrind/import_x_json2.v',
 ]
 
 fn vprintln(s string) {
@@ -61,7 +61,7 @@ fn test_all() {
 	eprintln(term.header(bench_message, '-'))
 	vexe := os.getenv('VEXE')
 	vroot := os.dir(vexe)
-	valgrind_test_path := 'vlib/v/tests/valgrind'
+	valgrind_test_path := 'vlib/v/slow_tests/valgrind'
 	dir := os.join_path(vroot, valgrind_test_path)
 	mut files := os.ls(dir) or { panic(err) }
 	files.sort()
diff --git a/vlib/v/tests/inout/bad_st_as.vv b/vlib/v/tests/inout/bad_st_as.vv
deleted file mode 100644
index d099b15b5..000000000
--- a/vlib/v/tests/inout/bad_st_as.vv
+++ /dev/null
@@ -1,13 +0,0 @@
-struct Struct {struct_name string }
-struct Interface {interface_name string}
-
-type Info = Struct | Interface
-
-fn main() {
-	mut info := Info{}
-	info = Struct{struct_name: 'Foo'}
-	s := info as Struct
-	println(s.struct_name)
-	i := info as Interface // wrong
-	println(i.interface_name)
-}
diff --git a/vlib/v/tests/inout/comptime_if_script_mode.vv b/vlib/v/tests/inout/comptime_if_script_mode.vv
deleted file mode 100644
index a0fb192b7..000000000
--- a/vlib/v/tests/inout/comptime_if_script_mode.vv
+++ /dev/null
@@ -1,5 +0,0 @@
-$if vinix {
-	println('vinix')
-} $else {
-	println('others')
-}
diff --git a/vlib/v/tests/inout/dump_expression.out b/vlib/v/tests/inout/dump_expression.out
deleted file mode 100644
index 9ec04322b..000000000
--- a/vlib/v/tests/inout/dump_expression.out
+++ /dev/null
@@ -1,32 +0,0 @@
-[vlib/v/tests/inout/dump_expression.vv:5] 1: 1
-[vlib/v/tests/inout/dump_expression.vv:10] 'a': a
-[vlib/v/tests/inout/dump_expression.vv:32] a: Aa{
-    log: &log.Logger(log.Log{
-        level: disabled
-        output_label: ''
-        ofile: os.File{
-            cfile: 0
-            fd: 0
-            is_opened: false
-        }
-        output_target: console
-        output_file_name: ''
-    })
-}
-[vlib/v/tests/inout/dump_expression.vv:33] p: Point{
-    x: 1
-    y: 2
-    z: 3
-}
-[vlib/v/tests/inout/dump_expression.vv:34] p_mut: Point{
-    x: 1
-    y: 2
-    z: 3
-}
-[vlib/v/tests/inout/dump_expression.vv:35] p_ptr: &Point{
-    x: 1
-    y: 2
-    z: 3
-}
-[vlib/v/tests/inout/dump_expression.vv:46] os.file_name(vfile): dump_expression.vv
-[vlib/v/tests/inout/dump_expression.vv:49] f.read(mut buf): 10
diff --git a/vlib/v/tests/inout/dump_generic_fn_mut_arg.out b/vlib/v/tests/inout/dump_generic_fn_mut_arg.out
deleted file mode 100644
index e8e6b5b7e..000000000
--- a/vlib/v/tests/inout/dump_generic_fn_mut_arg.out
+++ /dev/null
@@ -1 +0,0 @@
-[vlib/v/tests/inout/dump_generic_fn_mut_arg.vv:11] t: &Reptile{}
diff --git a/vlib/v/tests/inout/dump_generic_interface_ref_arg.out b/vlib/v/tests/inout/dump_generic_interface_ref_arg.out
deleted file mode 100644
index c082f14e3..000000000
--- a/vlib/v/tests/inout/dump_generic_interface_ref_arg.out
+++ /dev/null
@@ -1,6 +0,0 @@
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:30] mi.in_(): 1.0
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:31] mi.out(): 2.0
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:36] in_put.in_(): 1.0
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:37] in_put.out(): 2.0
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:39] in_put.in_(): 1.0
-[vlib/v/tests/inout/dump_generic_interface_ref_arg.vv:40] in_put.out(): 2.0
diff --git a/vlib/v/tests/inout/dump_match_expr.out b/vlib/v/tests/inout/dump_match_expr.out
deleted file mode 100644
index 61d614398..000000000
--- a/vlib/v/tests/inout/dump_match_expr.out
+++ /dev/null
@@ -1 +0,0 @@
-[vlib/v/tests/inout/dump_match_expr.vv:3] ast.MatchExpr: 1
diff --git a/vlib/v/tests/inout/dump_multiple_ptr.out b/vlib/v/tests/inout/dump_multiple_ptr.out
deleted file mode 100644
index 68749254a..000000000
--- a/vlib/v/tests/inout/dump_multiple_ptr.out
+++ /dev/null
@@ -1,4 +0,0 @@
-[vlib/v/tests/inout/dump_multiple_ptr.vv:3] i: 42
-[vlib/v/tests/inout/dump_multiple_ptr.vv:5] ir: &42
-[vlib/v/tests/inout/dump_multiple_ptr.vv:7] irr: &&42
-[vlib/v/tests/inout/dump_multiple_ptr.vv:9] irrr: &&&42
diff --git a/vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.out b/vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.out
deleted file mode 100644
index 3138f05e4..000000000
--- a/vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.out
+++ /dev/null
@@ -1,23 +0,0 @@
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': int 1
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': int 1
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:36] next(1): 0.0
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': f64 1.0
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': f64 1.0
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:37] next(1.0): 64.0
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:19] '${T.name} $input': f64 11.1
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': f64 11.1
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:38] next(11.1): 64.0
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:15] '${T.name} $input': Score Score{
-    ave: 23.4
-}
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': Score Score{
-    ave: 23.4
-}
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:42] next(ave): 23.4
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:15] '${T.name} $input': &Score &Score{
-    ave: 23.4
-}
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:26] '${T.name} $input': &Score &Score{
-    ave: 23.4
-}
-[vlib/v/tests/inout/dump_nested_generic_fn_call_ref_arg.vv:43] next(&ave): 23.4
diff --git a/vlib/v/tests/inout/dump_nil_voidptr.out b/vlib/v/tests/inout/dump_nil_voidptr.out
deleted file mode 100644
index be5cde440..000000000
--- a/vlib/v/tests/inout/dump_nil_voidptr.out
+++ /dev/null
@@ -1,2 +0,0 @@
-[vlib/v/tests/inout/dump_nil_voidptr.vv:11] a: &nil
-[vlib/v/tests/inout/dump_nil_voidptr.vv:13] a: &nil
diff --git a/vlib/v/tests/inout/dump_none.out b/vlib/v/tests/inout/dump_none.out
deleted file mode 100644
index 828cf154e..000000000
--- a/vlib/v/tests/inout/dump_none.out
+++ /dev/null
@@ -1 +0,0 @@
-[vlib/v/tests/inout/dump_none.vv:2] none: none
diff --git a/vlib/v/tests/inout/dump_shared_arg.out b/vlib/v/tests/inout/dump_shared_arg.out
deleted file mode 100644
index fd00585d6..000000000
--- a/vlib/v/tests/inout/dump_shared_arg.out
+++ /dev/null
@@ -1,3 +0,0 @@
-[vlib/v/tests/inout/dump_shared_arg.vv:12] inst: &AtomicStruct{
-    a: 1
-}
diff --git a/vlib/v/tests/inout/dump_sumtype_of_fntype.out b/vlib/v/tests/inout/dump_sumtype_of_fntype.out
deleted file mode 100644
index 2c2128dcc..000000000
--- a/vlib/v/tests/inout/dump_sumtype_of_fntype.out
+++ /dev/null
@@ -1 +0,0 @@
-[vlib/v/tests/inout/dump_sumtype_of_fntype.vv:10] main.MyFnSumtype(main.f): MyFnSumtype(fn (int) v.ast.Expr)
diff --git a/vlib/v/tests/inout/hello_devs.vv b/vlib/v/tests/inout/hello_devs.vv
deleted file mode 100644
index ab2df2369..000000000
--- a/vlib/v/tests/inout/hello_devs.vv
+++ /dev/null
@@ -1,7 +0,0 @@
-fn main() {
-	areas := ['game', 'web', 'tools', 'science', 'systems', 'embedded']
-	for i :=0; i < areas.len; i++{
-		area:=areas[i]
-		println('Hello, $area developers!')
-	}
-}
diff --git a/vlib/v/tests/inout/struct_field_option.out b/vlib/v/tests/inout/struct_field_option.out
deleted file mode 100644
index 7292b2a8a..000000000
--- a/vlib/v/tests/inout/struct_field_option.out
+++ /dev/null
@@ -1,26 +0,0 @@
-1
-[vlib/v/tests/inout/struct_field_option.vv:15] f.bar?: 1
-2
-[vlib/v/tests/inout/struct_field_option.vv:22] f.bar?: 2
-3
-[vlib/v/tests/inout/struct_field_option.vv:26] f.bar?: 3
-3
-[vlib/v/tests/inout/struct_field_option.vv:30] a: 3
-9999
-[vlib/v/tests/inout/struct_field_option.vv:33] b: 9999
-4
-[vlib/v/tests/inout/struct_field_option.vv:37] sum: 4
-4
-[vlib/v/tests/inout/struct_field_option.vv:40] sum: 4
-3
-none
-3
-Foo{
-    bar: 3
-    baz: 0
-}
-[vlib/v/tests/inout/struct_field_option.vv:61] f: Foo{
-    bar: 3
-    baz: 0
-}
-1
\ No newline at end of file
diff --git a/vlib/v/tests/inout/tmpl_expand_v_source_code.vv b/vlib/v/tests/inout/tmpl_expand_v_source_code.vv
deleted file mode 100644
index 21bd4f0c1..000000000
--- a/vlib/v/tests/inout/tmpl_expand_v_source_code.vv
+++ /dev/null
@@ -1,18 +0,0 @@
-module main
-
-const codepath_file = @FILE
-
-fn  main() {
-	togenerate := ["user","circle"]
-	for name in togenerate{
-		object :=  name
-		object_u := name.capitalize()
-		objects :=  name+"s"
-		objects_u := name.capitalize()+"s"
-		mut txt := $tmpl('data_obj.v.templ')
-	    txt = txt.replace("/////////// THIS IS THE TEMPLATE, THIS CAN BE MODIFIED","")
-		println(txt)
-	}
-	println('OK')
-}
-
diff --git a/vlib/v/tests/known_errors/known_errors_test.v b/vlib/v/tests/known_errors/known_errors_test.v
index 63059b4d5..9b143613e 100644
--- a/vlib/v/tests/known_errors/known_errors_test.v
+++ b/vlib/v/tests/known_errors/known_errors_test.v
@@ -7,7 +7,7 @@ const vroot = os.dir(vexe)
 const testdata_folder = 'vlib/v/tests/known_errors/testdata'
 
 fn test_known_errors_testdata_folder_exists() {
-	os.chdir(vroot)?
+	os.chdir(vroot)!
 	assert os.is_dir(testdata_folder)
 }
 
diff --git a/vlib/v/tests/repl/entire_commented_module.repl b/vlib/v/tests/repl/entire_commented_module.repl
deleted file mode 100644
index 40693ce83..000000000
--- a/vlib/v/tests/repl/entire_commented_module.repl
+++ /dev/null
@@ -1,7 +0,0 @@
-import v.tests.modules.acommentedmodule
-===output===
-builder error: bad module definition: .entire_commented_module.repl.vrepl_temp.v imports module "v.tests.modules.acommentedmodule" but vlib/v/tests/modules/acommentedmodule/commentedfile.v is defined as module `main`
-    1 | import v.tests.modules.acommentedmodule
-      | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-    2 | import os
-    3 |
-- 
2.30.2