26 lines
739 B
Rust
26 lines
739 B
Rust
//@ revisions: explicit implicit
|
|
//@[implicit] check-pass
|
|
|
|
#![forbid(coherence_leak_check)]
|
|
#![feature(negative_impls, with_negative_coherence)]
|
|
|
|
pub trait Marker {}
|
|
|
|
#[cfg(implicit)]
|
|
impl<T: ?Sized> !Marker for &T {}
|
|
|
|
#[cfg(explicit)]
|
|
impl<'a, T: ?Sized + 'a> !Marker for &'a T {}
|
|
|
|
trait FnMarker {}
|
|
|
|
// Unifying these two impls below results in a `T: '!0` obligation
|
|
// that we shouldn't need to care about. Ideally, we'd treat that
|
|
// as an assumption when proving `&'!0 T: Marker`...
|
|
impl<T: ?Sized + Marker> FnMarker for fn(T) {}
|
|
impl<T: ?Sized> FnMarker for fn(&T) {}
|
|
//[explicit]~^ ERROR conflicting implementations of trait `FnMarker` for type `fn(&_)`
|
|
//[explicit]~| WARN the behavior may change in a future release
|
|
|
|
fn main() {}
|