error[E0716]: temporary value dropped while borrowed
  --> $DIR/borrowck-borrow-from-temporary.rs:19:24
   |
LL |     let &Foo(ref x) = &id(Foo(3)); //~ ERROR borrowed value does not live long enough
   |                        ^^^^^^^^^^ creates a temporary which is freed while still in use
LL |     x
LL | }
   | - temporary value is freed at the end of this statement
   |
note: borrowed value must be valid for the lifetime 'a as defined on the function body at 18:8...
  --> $DIR/borrowck-borrow-from-temporary.rs:18:8
   |
LL | fn foo<'a>() -> &'a isize {
   |        ^^

error: aborting due to previous error

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