error[E0716]: temporary value dropped while borrowed
  --> $DIR/static-reference-to-fn-2.rs:18:22
   |
LL | fn state1(self_: &mut StateMachineIter) -> Option<&'static str> {
   |           ----- has type `&mut StateMachineIter<'1>`
LL |     self_.statefn = &id(state2 as StateMachineFunc);
   |     -----------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- temporary value is freed at the end of this statement
   |     |                |
   |     |                creates a temporary value which is freed while still in use
   |     assignment requires that borrow lasts for `'1`

error[E0716]: temporary value dropped while borrowed
  --> $DIR/static-reference-to-fn-2.rs:24:22
   |
LL | fn state2(self_: &mut StateMachineIter) -> Option<(&'static str)> {
   |           ----- has type `&mut StateMachineIter<'1>`
LL |     self_.statefn = &id(state3 as StateMachineFunc);
   |     -----------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- temporary value is freed at the end of this statement
   |     |                |
   |     |                creates a temporary value which is freed while still in use
   |     assignment requires that borrow lasts for `'1`

error[E0716]: temporary value dropped while borrowed
  --> $DIR/static-reference-to-fn-2.rs:30:22
   |
LL | fn state3(self_: &mut StateMachineIter) -> Option<(&'static str)> {
   |           ----- has type `&mut StateMachineIter<'1>`
LL |     self_.statefn = &id(finished as StateMachineFunc);
   |     -----------------^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^- temporary value is freed at the end of this statement
   |     |                |
   |     |                creates a temporary value which is freed while still in use
   |     assignment requires that borrow lasts for `'1`

error[E0515]: cannot return value referencing temporary value
  --> $DIR/static-reference-to-fn-2.rs:40:5
   |
LL | /     StateMachineIter {
LL | |
LL | |         statefn: &id(state1 as StateMachineFunc)
   | |                   ------------------------------ temporary value created here
LL | |     }
   | |_____^ returns a value referencing data owned by the current function
   |
   = help: use `.collect()` to allocate the iterator

error: aborting due to 4 previous errors

Some errors have detailed explanations: E0515, E0716.
For more information about an error, try `rustc --explain E0515`.