Lox::VM

We have to set a limit on call frames to avoid stack overflow, e.g. in the case of infinite recursion.

The behavior of splat arguments in Crystal is a little unexpected. Given the definition above where the overload is (String, *Object), I would expect that passing in just a string and no additional arguments would work, but instead, I get this error:

Error: no overload matches 'Lox::VM.runtime_error!' with type String

Defining this overload for (String) works. I wasn't able to pass in an empty tuple/array of object, e.g. *([] of Object) so I just pass in an arbitrary tuple of one Nil, since the args shouldn't matter in this case.