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// check-pass #![feature(impl_trait_in_assoc_type)] pub trait AssociatedImpl { type ImplTrait; fn f() -> Self::ImplTrait; } struct S<T>(T); trait Associated { type A; } impl<'a, T: Associated<A = &'a ()>> AssociatedImpl for S<T> { type ImplTrait = impl core::fmt::Debug; fn f() -> Self::ImplTrait { () } } fn main() {}