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// compile-flags: -Ztrait-solver=next trait Trait {} struct W<T>(T); impl<T, U> Trait for W<(W<T>, W<U>)> where W<T>: Trait, W<U>: Trait, { } fn impls<T: Trait>() {} fn main() { impls::<W<_>>(); //~^ ERROR overflow evaluating the requirement `W<_>: Trait` }