rust/tests/crashes/74299.rs

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//@ known-bug: #74299
#![feature(specialization)]
trait X {
type U;
fn f(&self) -> Self::U {
loop {}
}
}
impl<T> X for T {
default type U = ();
}
trait Y {
fn g(&self) {}
}
impl Y for <() as X>::U {}
impl Y for <i32 as X>::U {}
fn main() {
().f().g();
}