If your functions take any parameters, Nim will use the parameter types to distinguish between them, just like C++ does when you overload functions.

OTOH, if your hypothetical is that programmer X writes `to_me()` while a different programmer Y writes `tome()`, and the two functions just happen to be identical in all parameter types... well, that can already happen anyway where two programmers each independently write a function with the same name.

Nim has a simple, clear specification of how identifiers will be compared: http://nim-lang.org/docs/strutils.html#normalize,string

There's no secret magic happening.