| // Test a case where you have an impl of `Foo<X>` for all `X` that |
| // is being applied to `for<'a> Foo<&'a mut X>`. Issue #19730. |
| |
| trait Foo<X> { |
| fn foo(&self, x: X) { } |
| } |
| |
| fn want_hrtb<T>() |
| where T : for<'a> Foo<&'a isize> |
| { |
| } |
| |
| // AnyInt implements Foo<&'a isize> for any 'a, so it is a match. |
| struct AnyInt; |
| impl<'a> Foo<&'a isize> for AnyInt { } |
| fn give_any() { |
| want_hrtb::<AnyInt>() |
| } |
| |
| // StaticInt only implements Foo<&'static isize>, so it is an error. |
| struct StaticInt; |
| impl Foo<&'static isize> for StaticInt { } |
| fn give_static() { |
| want_hrtb::<StaticInt>() //~ ERROR |
| } |
| |
| // AnyInt implements Foo<&'a isize> for any 'a, so it is a match. |
| impl<'a> Foo<&'a isize> for &'a u32 { } |
| fn give_some<'a>() { |
| want_hrtb::<&'a u32>() //~ ERROR |
| } |
| |
| fn main() { } |