rust/src/test/ui/lifetimes/lifetime-errors/ex3-both-anon-regions-both-are-structs-2.rs

// revisions: base nll
// ignore-compare-mode-nll
//[nll] compile-flags: -Z borrowck=mir

struct Ref<'a, 'b> {
    a: &'a u32,
    b: &'b u32,
}

fn foo(mut x: Ref, y: Ref) {
    x.b = y.b;
    //[base]~^ ERROR lifetime mismatch
    //[nll]~^^ ERROR lifetime may not live long enough
}

fn main() {}