mirror of https://github.com/rust-lang/rust
30 lines
828 B
Rust
30 lines
828 B
Rust
//@ revisions: old next
|
|
//@[next] compile-flags: -Znext-solver
|
|
|
|
// Tests that type alias impls traits do not leak auto-traits for
|
|
// the purposes of coherence checking
|
|
#![feature(type_alias_impl_trait)]
|
|
|
|
trait OpaqueTrait {}
|
|
impl<T> OpaqueTrait for T {}
|
|
type OpaqueType = impl OpaqueTrait;
|
|
fn mk_opaque() -> OpaqueType {
|
|
()
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct D<T>(T);
|
|
|
|
trait AnotherTrait {}
|
|
impl<T: Send> AnotherTrait for T {}
|
|
|
|
// This is in error, because we cannot assume that `OpaqueType: !Send`.
|
|
// (We treat opaque types as "foreign types" that could grow more impls
|
|
// in the future.)
|
|
impl AnotherTrait for D<OpaqueType> {
|
|
//[old]~^ ERROR conflicting implementations of trait `AnotherTrait` for type `D<OpaqueType>`
|
|
//[next]~^^ ERROR conflicting implementations of trait `AnotherTrait` for type `D<_>`
|
|
}
|
|
|
|
fn main() {}
|