vlib/v/checker/tests/var_duplicate_const.vv:4:5: warning: duplicate of a const name `size`
    2 | 
    3 | fn main() {
    4 |     size := 11
      |     ~~~~
    5 |     println(main.size)
    6 | }
vlib/v/checker/tests/var_duplicate_const.vv:4:5: warning: unused variable: `size`
    2 | 
    3 | fn main() {
    4 |     size := 11
      |     ~~~~
    5 |     println(main.size)
    6 | }
vlib/v/checker/tests/var_duplicate_const.vv:1:7: notice: unused constant: `size`
    1 | const size = 22
      |       ~~~~~~~~~
    2 | 
    3 | fn main() {
================== C compilation error (from cc): ==============
cc: /tmp/v_502/var_duplicate_const.01KNN5X7W4MVH2B58E9FG5GJKE.tmp.c:2139:36: error: use of undeclared identifier 'size'
cc:  2139 |         builtin__println(builtin__int_str(size));
cc:       |                                           ^
cc: 1 error generated.
================================================================
Try passing `-g` when compiling, to see a .v file:line information, that correlates more with the C error.
(Alternatively, pass `-show-c-output`, to print the full C error message).
builder error: 
==================
C error found while compiling generated C code.
This can be caused by invalid C interop code, C compiler flags, or a V compiler bug.
If your code is pure V and this still happens, please report it using `v bug file.v`,
or goto https://github.com/vlang/v/issues/new/choose .
You can also use #help on Discord: https://discord.gg/vlang .