rust/src/test/ui/lifetimes/lifetime-errors/ex3-both-anon-regions-one-is-struct-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: &u32) {
    y = x.b;
    //[base]~^ ERROR lifetime mismatch
    //[nll]~^^ ERROR lifetime may not live long enough
    //[nll]~| ERROR cannot assign to immutable argument
}

fn main() { }