rust/tests/ui/impl-trait/in-trait/variance.rs

#![feature(rustc_attrs)]
#![allow(internal_features)]
#![rustc_variance_of_opaques]

trait Captures<'a> {}
impl<T> Captures<'_> for T {}

trait Foo<'i> {
    fn implicit_capture_early<'a: 'a>() -> impl Sized {}
    //~^ [o, *, *, o, o]
    // Self, 'i, 'a, 'i_duplicated, 'a_duplicated

    fn explicit_capture_early<'a: 'a>() -> impl Sized + Captures<'a> {} //~ [o, *, *, o, o]

    fn implicit_capture_late<'a>(_: &'a ()) -> impl Sized {} //~ [o, *, o, o]

    fn explicit_capture_late<'a>(_: &'a ()) -> impl Sized + Captures<'a> {} //~ [o, *, o, o]
}

fn main() {}