//@ check-pass #![feature(type_alias_impl_trait)] #![allow(dead_code)] // test that the type alias impl trait defining use is in a submodule fn main() {} type Foo = impl std::fmt::Display; type Bar = impl std::fmt::Display; mod foo { #[define_opaque(super::Foo)] pub(crate) fn foo() -> super::Foo { "foo" } pub(crate) mod bar { #[define_opaque(crate::Bar)] pub(crate) fn bar() -> crate::Bar { 1 } } } mod bar { pub type Baz = impl std::fmt::Display; } #[define_opaque(bar::Baz)] fn baz() -> bar::Baz { "boom" }