for _, ncase := range sw.Cases {
		for _, v := range ncase.List {
			if v.Op() != ir.OLITERAL {
				return false
			}
		}
	}
	return true
}

// endsInFallthrough reports whether stmts ends with a "fallthrough" statement.
func endsInFallthrough(stmts []ir.Node) (bool, src.XPos) {
	if len(stmts) == 0 {
		return false, src.NoXPos
	}
	i := len(stmts) - 1
	return stmts[i].Op() == ir.OFALL, stmts[i].Pos()
}