toNullable method

Implementation

(A, B, C, D)? toNullable() {
  final a = $1();
  if (a == null) {
    return null;
  }
  final b = $2();
  if (b == null) {
    return null;
  }
  final c = $3();
  if (c == null) {
    return null;
  }
  final d = $4();
  if (d == null) {
    return null;
  }

  return (a, b, c, d);
}