error[E0525]: expected a closure that implements the `FnMut` trait, but this closure only implements `FnOnce`
  --> $DIR/move-ref-patterns-closure-captures.rs:9:14
   |
LL |     let c1 = || {
   |              ^^ this closure implements `FnOnce`, not `FnMut`
...
LL |         drop::<U>(_x1);
   |                   --- closure is `FnOnce` because it moves the variable `_x1` out of its environment
...
LL |     accept_fn_mut(&c1);
   |     ------------- the requirement to implement `FnMut` derives from here

error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
  --> $DIR/move-ref-patterns-closure-captures.rs:9:14
   |
LL |     let c1 = || {
   |              ^^ this closure implements `FnOnce`, not `Fn`
...
LL |         drop::<U>(_x1);
   |                   --- closure is `FnOnce` because it moves the variable `_x1` out of its environment
...
LL |     accept_fn(&c1);
   |     --------- the requirement to implement `Fn` derives from here

error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnMut`
  --> $DIR/move-ref-patterns-closure-captures.rs:20:14
   |
LL |     let c2 = || {
   |              ^^ this closure implements `FnMut`, not `Fn`
...
LL |         drop::<&mut U>(_x2);
   |                        --- closure is `FnMut` because it mutates the variable `_x2` here
...
LL |     accept_fn(&c2);
   |     --------- the requirement to implement `Fn` derives from here

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0525`.