error[E0716]: temporary value dropped while borrowed
  --> $DIR/lifetime_errors_on_promotion_misusage.rs:11:35
   |
LL |     let phantom_pinned = identity(pin!(PhantomPinned));
   |                                   ^^^^^^^^^^^^^^^^^^^ - temporary value is freed at the end of this statement
   |                                   |
   |                                   creates a temporary value which is freed while still in use
LL |
LL |     stuff(phantom_pinned)
   |           -------------- borrow later used here
   |
   = note: consider using a `let` binding to create a longer lived value
   = note: this error originates in the macro `pin` (in Nightly builds, run with -Z macro-backtrace for more info)

error[E0716]: temporary value dropped while borrowed
  --> $DIR/lifetime_errors_on_promotion_misusage.rs:18:30
   |
LL |     let phantom_pinned = {
   |         -------------- borrow later stored here
LL |         let phantom_pinned = pin!(PhantomPinned);
   |                              ^^^^^^^^^^^^^^^^^^^ creates a temporary value which is freed while still in use
...
LL |     };
   |     - temporary value is freed at the end of this statement
   |
   = note: consider using a `let` binding to create a longer lived value
   = note: this error originates in the macro `pin` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors

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