Error trying to create nullable function

[andy-hanson]

export function test(b: boolean): (() => i32) | null {
	if (b) {
		return (): i32 => 1;
	} else {
		return null;
	}
}

Expected: No error.
Actual:

ERROR AS200: Conversion from type 'usize' to '(() => i32) | null' requires an explicit cast.

 		return null;

[MaxGraey]

This could be fixed currently like:

export function test(b: boolean): (() => i32) | null {
  if (b) {
    return (): i32 => 1;
  } else {
    return <(() => i32) | null>null;
  }
}

But for sure this need enchance