tests: use 'test_must_be_empty' instead of 'test_cmp <empty> <out>'

[git] / t / t4018 / golang-long-func

func RIGHT(aVeryVeryVeryLongVariableName AVeryVeryVeryLongType,
        anotherLongVariableName AnotherLongType) {
        a := 5
        b := ChangeMe
}