//revisions: ast mir //[mir] compile-flags: -Z borrowck=mir #![allow(unused_assignments)] struct Wrap<'a> { w: &'a mut u32 } fn foo() { let mut x = 22; let wrapper = Wrap { w: &mut x }; x += 1; //[ast]~ ERROR cannot assign to `x` because it is borrowed [E0506] //[mir]~^ ERROR cannot use `x` because it was mutably borrowed [E0503] *wrapper.w += 1; } fn main() { }