error[E0716]: temporary value dropped while borrowed
  --> $DIR/issue-11493.rs:6:35
   |
LL |     let y = x.as_ref().unwrap_or(&id(5));
   |                                   ^^^^^ - temporary value is freed at the end of this statement
   |                                   |
   |                                   creates a temporary value which is freed while still in use
LL |     let _ = &y;
   |             -- borrow later used here
   |
help: consider using a `let` binding to create a longer lived value
   |
LL ~     let binding = id(5);
LL ~     let y = x.as_ref().unwrap_or(&binding);
   |

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0716`.