vlib/v/checker/tests/option_fn_err.vv:7:11: notice: unused parameter: `v`
    5 | }
    6 | 
    7 | fn bar[T](v T) ?T {
      |           ^
    8 |     return none
    9 | }
vlib/v/checker/tests/option_fn_err.vv:32:16: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `twice`
   30 |     foo()
   31 |     _ := bar(0)
   32 |     println(twice(bar(0)))
      |                   ~~~~~~
   33 | 
   34 |     // anon fn
vlib/v/checker/tests/option_fn_err.vv:35:16: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `anon`
   33 | 
   34 |     // anon fn
   35 |     fn (_ int) {}(bar(0))
      |                   ~~~~~~
   36 | 
   37 |     // assert
vlib/v/checker/tests/option_fn_err.vv:38:9: error: assert can be used only with `bool` expressions, but found `bool` instead
   36 | 
   37 |     // assert
   38 |     assert bar(true)
      |            ~~~~~~~~~
   39 | 
   40 |     // struct
vlib/v/checker/tests/option_fn_err.vv:43:3: error: cannot assign an Option value to a non-option struct field
   41 |     mut v := Data{
   42 |         f:     fn (_ int) {}
   43 |         value: bar(0)
      |         ~~~~~~~~~~~~~
   44 |         opt:   bar(0)
   45 |     }
vlib/v/checker/tests/option_fn_err.vv:46:8: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `Data.add`
   44 |         opt:   bar(0)
   45 |     }
   46 |     v.add(bar(0)) // call method
      |           ~~~~~~
   47 |     v.f(bar(0)) // call fn field
   48 |
vlib/v/checker/tests/option_fn_err.vv:47:6: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `Data.f`
   45 |     }
   46 |     v.add(bar(0)) // call method
   47 |     v.f(bar(0)) // call fn field
      |         ~~~~~~
   48 | 
   49 |     // array
vlib/v/checker/tests/option_fn_err.vv:51:6: error: unwrapped Option cannot be used in an infix expression
   49 |     // array
   50 |     mut arr := [1, 2]
   51 |     arr << bar(0)
      |         ~~
   52 |     // init
   53 |     _ := [bar(0)]
vlib/v/checker/tests/option_fn_err.vv:54:27: error: cannot use unwrapped Option as initializer
   52 |     // init
   53 |     _ := [bar(0)]
   54 |     _ := []int{len: 1, init: bar(0)}
      |                              ~~~~~~
   55 |     _ := [bar(0)]!
   56 |     _ := [1]int{init: bar(0)}
vlib/v/checker/tests/option_fn_err.vv:56:20: error: cannot use unwrapped Option as initializer
   54 |     _ := []int{len: 1, init: bar(0)}
   55 |     _ := [bar(0)]!
   56 |     _ := [1]int{init: bar(0)}
      |                       ~~~~~~
   57 |     // index
   58 |     println(arr[bar(0)])
vlib/v/checker/tests/option_fn_err.vv:58:14: error: cannot use Option or Result as index (array type `[]int`)
   56 |     _ := [1]int{init: bar(0)}
   57 |     // index
   58 |     println(arr[bar(0)])
      |                 ~~~~~~
   59 |     // array builtin methods
   60 |     arr.insert(0, bar(0))
vlib/v/checker/tests/option_fn_err.vv:60:16: error: cannot use `?int` as `voidptr`, it must be unwrapped first in argument 2 to `[]int.insert`
   58 |     println(arr[bar(0)])
   59 |     // array builtin methods
   60 |     arr.insert(0, bar(0))
      |                   ~~~~~~
   61 |     arr.prepend(bar(0))
   62 |     arr.contains(bar(0))
vlib/v/checker/tests/option_fn_err.vv:61:14: error: cannot use `?int` as `voidptr`, it must be unwrapped first in argument 1 to `[]int.prepend`
   59 |     // array builtin methods
   60 |     arr.insert(0, bar(0))
   61 |     arr.prepend(bar(0))
      |                 ~~~~~~
   62 |     arr.contains(bar(0))
   63 |     arr.index(bar(0))
vlib/v/checker/tests/option_fn_err.vv:62:15: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `.contains()`
   60 |     arr.insert(0, bar(0))
   61 |     arr.prepend(bar(0))
   62 |     arr.contains(bar(0))
      |                  ~~~~~~
   63 |     arr.index(bar(0))
   64 |     println(arr.map(bar(0)))
vlib/v/checker/tests/option_fn_err.vv:63:12: error: cannot use `?int` as `int`, it must be unwrapped first in argument 1 to `.index()`
   61 |     arr.prepend(bar(0))
   62 |     arr.contains(bar(0))
   63 |     arr.index(bar(0))
      |               ~~~~~~
   64 |     println(arr.map(bar(0)))
   65 |     println(arr.filter(bar(true)))
vlib/v/checker/tests/option_fn_err.vv:65:21: error: type mismatch, `bar` must return a bool
   63 |     arr.index(bar(0))
   64 |     println(arr.map(bar(0)))
   65 |     println(arr.filter(bar(true)))
      |                        ~~~~~~~~~
   66 |     println(arr.any(bar(true)))
   67 |     println(arr.all(bar(true)))
vlib/v/checker/tests/option_fn_err.vv:66:18: error: type mismatch, `bar` must return a bool
   64 |     println(arr.map(bar(0)))
   65 |     println(arr.filter(bar(true)))
   66 |     println(arr.any(bar(true)))
      |                     ~~~~~~~~~
   67 |     println(arr.all(bar(true)))
   68 |
vlib/v/checker/tests/option_fn_err.vv:67:18: error: type mismatch, `bar` must return a bool
   65 |     println(arr.filter(bar(true)))
   66 |     println(arr.any(bar(true)))
   67 |     println(arr.all(bar(true)))
      |                     ~~~~~~~~~
   68 | 
   69 |     match bar(0) {
vlib/v/checker/tests/option_fn_err.vv:70:3: error: `match` expression with Option type only checks against `none`, to match its value you must unwrap it first `var?`
   68 | 
   69 |     match bar(0) {
   70 |         0 {}
      |         ^
   71 |         else {}
   72 |     }