#![feature(type_alias_impl_trait)] type Bar<'a, 'b> = impl PartialEq> + std::fmt::Debug; fn bar<'a, 'b>(i: &'a i32) -> Bar<'a, 'b> { //~^ ERROR can't compare `&i32` with `Bar<'b, 'a>` i } type Foo<'a, 'b> = (i32, impl PartialEq> + std::fmt::Debug); fn foo<'a, 'b>(i: &'a i32) -> Foo<'a, 'b> { //~^ ERROR can't compare `&i32` with `(i32, &i32)` (42, i) } type Moo<'a, 'b> = (i32, impl PartialEq> + std::fmt::Debug); fn moo<'a, 'b>(i: &'a i32) -> Moo<'a, 'b> { //~^ ERROR can't compare `&i32` with `(i32, Moo<'b, 'a>::{opaque#0})` (42, i) } fn main() { let meh = 42; let muh = 69; assert_eq!(bar(&meh), bar(&meh)); }