RosettaCodeData/Task/Extend-your-language/Langur/extend-your-language-2.langur

given .x, .y {
    case true: ...          # both true
    case true, false: ...   # first true, second false
    case false, true: ...   # first false, second true
    case null, _: ...       # first null, second irrelevant
    default: ...            # other
}