exceptions.py


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class NebPanic(BaseException):
    pass

class InterpretPanic(NebPanic):
    def __init__(self, sym, msg, arg=None):
        big_message = f"[{sym.line}] '{sym.name}': {msg}"
        if arg is not None:
            big_message += f" (got {arg})"
        super().__init__(big_message)