edition = "2023";

package a;

option features.enum_type = CLOSED;

enum A4 {
  A4_ZERO = 0;
}

enum B4 {
  B4_ZERO = 0;
}

enum C4 {
  C4_ZERO = 0;
}

enum D4 {
  option features.enum_type = OPEN;
  D4_ZERO = 0;
}

enum C5 {
  C5_ZERO = 0;
}

enum C6 {
  option features.enum_type = OPEN;
  C6_ZERO = 0;
}
