error[E0277]: the trait bound `impl FnMut(usize) -> u32 + Copy: [const] FnMut(usize)` is not satisfied
  --> $DIR/const-closure-issue-125866-error.rs:8:22
   |
LL |         array[i] = f(i);
   |                    - ^
   |                    |
   |                    required by a bound introduced by this call

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0277`.