error[E0597]: borrowed value does not live long enough (Ast)
  --> $DIR/issue-11493.rs:20:35
   |
LL |     let y = x.as_ref().unwrap_or(&id(5));
   |                                   ^^^^^ - temporary value dropped here while still borrowed
   |                                   |
   |                                   temporary value does not live long enough
...
LL | }
   | - temporary value needs to live until here
   |
   = note: consider using a `let` binding to increase its lifetime

error: aborting due to previous error

For more information about this error, try `rustc --explain E0597`.