| 1 | struct Foo[U] { |
| 2 | f fn (string) U @[required] |
| 3 | } |
| 4 | |
| 5 | fn map_foo[T, U](f Foo[T], m fn (T) U) Foo[U] { |
| 6 | return Foo[U]{ |
| 7 | f: fn [f, m] [U](s string) U { |
| 8 | v := f.f(s) |
| 9 | return m(v) |
| 10 | } |
| 11 | } |
| 12 | } |
| 13 | |
| 14 | fn test_generic_struct_fn_field_closure() { |
| 15 | f := Foo[string]{ |
| 16 | f: fn (s string) string { |
| 17 | return s |
| 18 | } |
| 19 | } |
| 20 | v := map_foo(f, fn (_ string) int { |
| 21 | return -1 |
| 22 | }) |
| 23 | assert v.f('foo') == -1 |
| 24 | } |
| 25 |