rust/tests/ui/pattern/usefulness/const-partial_eq-fallback-ice.rs

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#![allow(warnings)]
struct MyType;
impl PartialEq<usize> for MyType {
fn eq(&self, y: &usize) -> bool {
true
}
}
const CONSTANT: &&MyType = &&MyType;
fn main() {
if let CONSTANT = &&MyType {
//~^ ERROR must be annotated with `#[derive(PartialEq, Eq)]`
println!("did match!");
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}
}