error[E0515]: cannot return value referencing temporary value
  --> $DIR/borrowck-borrow-from-temporary.rs:10:5
   |
LL |     let &Foo(ref x) = &id(Foo(3));
   |                        ---------- temporary value created here
LL |     x
   |     ^ returns a value referencing data owned by the current function

error: aborting due to previous error

For more information about this error, try `rustc --explain E0515`.