| #![feature(type_alias_impl_trait)] | |
| #![allow(dead_code)] | |
| //@ revisions: current next | |
| //@ ignore-compare-mode-next-solver (explicit revisions) | |
| //@[next] compile-flags: -Znext-solver | |
| use std::fmt::Debug; | |
| type FooX = impl Debug; | |
| trait Foo<A> {} | |
| impl Foo<()> for () {} | |
| impl Foo<u32> for () {} | |
| #[define_opaque(FooX)] | |
| fn foo() -> impl Foo<FooX> { | |
| //[current]~^ ERROR: the trait bound `(): Foo<FooX>` is not satisfied | |
| () | |
| //[next]~^ ERROR: type annotations needed | |
| } | |
| fn main() {} |