| #![feature(rustc_attrs)] | |
| #![allow(unused)] | |
| // revisions: migrate nll | |
| #![cfg_attr(nll, feature(nll))] | |
| fn f() { | |
| let mut x: Box<()> = Box::new(()); | |
| || { | |
| &mut x | |
| }; | |
| //[migrate]~^^ WARNING captured variable cannot escape `FnMut` closure body | |
| //[migrate]~| WARNING this error has been downgraded to a warning | |
| //[migrate]~| WARNING this warning will become a hard error in the future | |
| //[nll]~^^^^^ ERROR captured variable cannot escape `FnMut` closure body | |
| } | |
| #[rustc_error] | |
| fn main() {} | |
| //[migrate]~^ ERROR |