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// check-pass #![feature(type_alias_impl_trait)] #![deny(improper_ctypes)] pub trait Foo { type Assoc; } impl Foo for () { type Assoc = u32; } type Bar = impl Foo<Assoc = u32>; fn assign() -> Bar {} extern "C" { pub fn lint_me() -> <Bar as Foo>::Assoc; } fn main() {}