error[E0382]: use of moved value: `f`
  --> $DIR/borrow-closures-instead-of-move.rs:3:22
   |
LL | fn takes_fn(f: impl Fn()) {
   |             - move occurs because `f` has type `impl Fn()`, which does not implement the `Copy` trait
LL |     loop {
   |     ---- inside of this loop
LL |         takes_fnonce(f);
   |                      ^ value moved here, in previous iteration of loop
   |
note: consider changing this parameter type in function `takes_fnonce` to borrow instead if owning the value isn't necessary
  --> $DIR/borrow-closures-instead-of-move.rs:34:20
   |
LL | fn takes_fnonce(_: impl FnOnce()) {}
   |    ------------    ^^^^^^^^^^^^^ this parameter takes ownership of the value
   |    |
   |    in this function
help: if `impl Fn()` implemented `Clone`, you could clone the value
  --> $DIR/borrow-closures-instead-of-move.rs:1:16
   |
LL | fn takes_fn(f: impl Fn()) {
   |                ^^^^^^^^^ consider constraining this type parameter with `Clone`
LL |     loop {
LL |         takes_fnonce(f);
   |                      - you could clone this value
help: consider borrowing `f`
   |
LL |         takes_fnonce(&f);
   |                      +

error[E0382]: use of moved value: `m`
  --> $DIR/borrow-closures-instead-of-move.rs:14:18
   |
LL | fn takes_fn_mut(m: impl FnMut()) {
   |                 - move occurs because `m` has type `impl FnMut()`, which does not implement the `Copy` trait
LL |     if maybe() {
LL |         takes_fnonce(m);
   |                      - value moved here
...
LL |     takes_fnonce(m);
   |                  ^ value used here after move
   |
note: consider changing this parameter type in function `takes_fnonce` to borrow instead if owning the value isn't necessary
  --> $DIR/borrow-closures-instead-of-move.rs:34:20
   |
LL | fn takes_fnonce(_: impl FnOnce()) {}
   |    ------------    ^^^^^^^^^^^^^ this parameter takes ownership of the value
   |    |
   |    in this function
help: if `impl FnMut()` implemented `Clone`, you could clone the value
  --> $DIR/borrow-closures-instead-of-move.rs:9:20
   |
LL | fn takes_fn_mut(m: impl FnMut()) {
   |                    ^^^^^^^^^^^^ consider constraining this type parameter with `Clone`
LL |     if maybe() {
LL |         takes_fnonce(m);
   |                      - you could clone this value
help: consider mutably borrowing `m`
   |
LL |         takes_fnonce(&mut m);
   |                      ++++

error[E0382]: borrow of moved value: `closure`
  --> $DIR/borrow-closures-instead-of-move.rs:25:5
   |
LL |     takes_fnonce(closure);
   |                  ------- value moved here
LL |
LL |     closure();
   |     ^^^^^^^ value borrowed here after move
   |
note: closure cannot be moved more than once as it is not `Copy` due to moving the variable `x` out of its environment
  --> $DIR/borrow-closures-instead-of-move.rs:21:9
   |
LL |         x += 1;
   |         ^
help: consider mutably borrowing `closure`
   |
LL |     takes_fnonce(&mut closure);
   |                  ++++

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0382`.