36 lines
886 B
Rust
36 lines
886 B
Rust
// 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
|
|
}
|
|
|
|
// &'a u32 only implements Foo<&'a isize> for specific 'a, so it is an error.
|
|
impl<'a> Foo<&'a isize> for &'a u32 { }
|
|
fn give_some<'a>() {
|
|
want_hrtb::<&'a u32>()
|
|
//~^ ERROR lifetime may not live long enough
|
|
//~| ERROR implementation of `Foo` is not general enough
|
|
}
|
|
|
|
fn main() { }
|