File: exponential-trait-goals.rs

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//@ compile-flags: -Znext-solver

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`
}