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#![feature(type_alias_impl_trait)]
#![allow(unused)]
#![deny(improper_ctypes)]
pub trait TraitA {
type Assoc;
}
impl TraitA for u32 {
type Assoc = u32;
}
pub trait TraitB {
type Assoc;
}
impl<T> TraitB for T
where
T: TraitA,
{
type Assoc = <T as TraitA>::Assoc;
}
type AliasA = impl TraitA<Assoc = u32>;
type AliasB = impl TraitB;
#[define_opaque(AliasA)]
fn use_of_a() -> AliasA {
3
}
#[define_opaque(AliasB)]
fn use_of_b() -> AliasB {
3
}
extern "C" {
fn lint_me() -> <AliasB as TraitB>::Assoc;
//~^ ERROR `extern` block uses type `AliasB`, which is not FFI-safe
}
fn main() {}
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