Yield multiple (code, function) tuples.

def global_fixes():
    """Yield multiple (code, function) tuples."""
    for function in list(globals().values()):
        if inspect.isfunction(function):
            arguments = _get_parameters(function)
            if arguments[:1] != ['source']:
                continue

            code = extract_code_from_function(function)
            if code:
                yield (code, function)