rust/src/test/ui/impl-trait/multiple-lifetimes/ordinary-bounds-pick-original-elided.rs

// edition:2018
// compile-pass
// revisions: migrate mir
//[mir]compile-flags: -Z borrowck=mir

#![feature(member_constraints)]

trait Trait<'a, 'b> { }
impl<T> Trait<'_, '_> for T { }

// Test case where we have elision in the impl trait and we have to
// pick the right region.

// Ultimately `Trait<'x, 'static>`.
fn upper_bounds1(a: &u8) -> impl Trait<'_, 'static> {
    (a, a)
}

// Ultimately `Trait<'x, 'x>`, so not really multiple bounds.
fn upper_bounds2(a: &u8) -> impl Trait<'_, '_> {
    (a, a)
}

// Kind of a weird annoying case.
fn upper_bounds3<'b>(a: &u8) -> impl Trait<'_, 'b> {
    (a, a)
}

fn main() { }