error[E0597]: borrowed value does not live long enough (Ast)
  --> $DIR/issue-46472.rs:14:10
   |
14 |     &mut 4
   |          ^ temporary value does not live long enough
...
17 | }
   | - temporary value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:1...
  --> $DIR/issue-46472.rs:13:1
   |
13 | / fn bar<'a>() -> &'a mut u32 {
14 | |     &mut 4
15 | |     //~^ ERROR borrowed value does not live long enough (Ast) [E0597]
16 | |     //~| ERROR borrowed value does not live long enough (Mir) [E0597]
17 | | }
   | |_^

error[E0597]: borrowed value does not live long enough (Mir)
  --> $DIR/issue-46472.rs:14:10
   |
14 |     &mut 4
   |          ^ temporary value does not live long enough
...
17 | }
   |  - temporary value only lives until here
   |
note: borrowed value must be valid for the lifetime 'a as defined on the function body at 13:1...
  --> $DIR/issue-46472.rs:13:1
   |
13 | / fn bar<'a>() -> &'a mut u32 {
14 | |     &mut 4
15 | |     //~^ ERROR borrowed value does not live long enough (Ast) [E0597]
16 | |     //~| ERROR borrowed value does not live long enough (Mir) [E0597]
17 | | }
   | |_^

error: aborting due to 2 previous errors