gistfile1.txt

enum MarkerType {
    Start,
    Middle,
    End
}

type RenderMarkerFn = fn (MarkerType,
                          f64,  // xpos
                          f64,  // ypos
                          f64); // computed_angle

// This is fine
fn emit_marker_at_start_of_segment (some args ...,
                                    emit_fn:     RenderMarkerFn) { ... }
                          

// I get an error when I call that like this
emit_marker_at_start_of_segment (builder,
                                 |marker_type: MarkerType, x: f64, y: f64, computed_angle: f64| { ... });
    |  __________________________^ starting here...
                                   
    = note: expected type `fn(marker::MarkerType, f64, f64, f64)`
    = note:    found type `[closure@marker.rs:683:36: 690:37 draw_ctx:_, linewidth:_]`