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// check-pass
#![feature(const_trait_impl, const_cmp, const_default_impls, derive_const)]
pub struct A;
impl const Default for A {
fn default() -> A { A }
}
impl const PartialEq for A {
fn eq(&self, _: &A) -> bool { true }
}
#[derive_const(Default, PartialEq)]
pub struct S((), A);
const _: () = assert!(S((), A) == S::default());
fn main() {}
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