??? vs. pass - Squeng/Polyglot GitHub Wiki

Scala has a predefined method named ??? of type Nothing that would throw a NotImplementedError exception if it were invoked. It is very useful as a placeholder for a function or method whose body has to be completed still and must not silently do nothing at runtime.

def vergissMeinNicht(yada: String) = ???

Python has the pass statement, which, well, does nothing, not even throw an exception, and thus begs for being overlooked in production code.