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// check-pass #![feature(const_trait_impl, rustc_attrs)] #[const_trait] trait IntoIter { fn into_iter(self); } #[const_trait] trait Hmm: Sized { #[rustc_do_not_const_check] fn chain<U>(self, other: U) where U: IntoIter, { other.into_iter() } } fn main() {}