gistfile1.txt

fn emit_marker_at_start_of_segment<E> (some args...,
                                       emit_fn:     E) where E: Fn(MarkerType, f64, f64, f64) { ... }
                                       
fn emit_markers_for_path_builder<E> (builder: &RsvgPathBuilder,
                                     emit_fn: E) where E: Fn(MarkerType, f64, f64, f64) {
  for ... {

     ... multiple calls to functions which take in emit_fn ...
     
     emit_marker_at_start_of_segment (..., emit_fn);

  }
}

error[E0382]: use of moved value: `emit_fn`
   --> marker.rs:710:137
    |
710 |                         emit_marker_at_end_of_segment (&segments[i - 1], MarkerType::End, angle_from_vector (incoming_vx, incoming_vy), emit_fn);
    |                                                                                                                                         ^^^^^^^ value moved here in previous iteration of loop
    |
    = note: move occurs because `emit_fn` has type `E`, which does not implement the `Copy` trait