static void Test() {
// Just want to test if this is a valid value; we don't need the parsed value
if (!Int32.TryParse(_userInput, out _)) {
// ..
}
// Don't want the result of this method, just need to invoke it
_ = _someInterface.SomeMethod();
// Don't want to use these parameters in a lambda (C# 9+ only)
_someInterface.DoThing((_, _, param3, _) => param3 == "hello");
}