File: coherence-overlap-negate-not-use-feature-gate.rs

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rustc 1.70.0%2Bdfsg1-9
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use std::ops::DerefMut;

trait Foo {}
impl<T: DerefMut> Foo for T {}
impl<U> Foo for &U {}
//~^ ERROR: conflicting implementations of trait `Foo` for type `&_` [E0119]

fn main() {}