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// check-pass #![feature(auto_traits)] #![feature(negative_impls)] auto trait NotSame {} impl<A> !NotSame for (A, A) {} trait OneOfEach {} impl<A> OneOfEach for (A,) {} impl<A, B> OneOfEach for (A, B) where (B,): OneOfEach, (A, B): NotSame, { } fn main() {}