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//@ 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() {}
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