error[E0308]: mismatched types
  --> $DIR/mut-mut-wont-coerce.rs:36:14
   |
LL |     make_foo(&mut &mut *result);
   |     -------- ^^^^^^^^^^^^^^^^^ expected `*mut *mut Foo`, found `&mut &mut Foo`
   |     |
   |     arguments to this function are incorrect
   |
   = note:    expected raw pointer `*mut *mut Foo`
           found mutable reference `&mut &mut Foo`
note: function defined here
  --> $DIR/mut-mut-wont-coerce.rs:30:4
   |
LL | fn make_foo(_: *mut *mut Foo) {
   |    ^^^^^^^^ ----------------

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.