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#![feature(type_alias_impl_trait)]
trait Allocator {
type Buffer;
}
struct DefaultAllocator;
impl<T> Allocator for DefaultAllocator {
//~^ ERROR: the type parameter `T` is not constrained
type Buffer = ();
}
type A = impl Fn(<DefaultAllocator as Allocator>::Buffer);
fn foo() -> A {
|_| ()
}
fn main() {}
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