def split_equal_string(input: str) -> T.Tuple[str, str]:
    """Split a string in the form `x=y`

    This assumes that the string has already been validated to split properly.
    """
    a, b = input.split('=', 1)
    return (a, b)
Split a string in the form `x=y`

    This assumes that the string has already been validated to split properly.
    
mesonbuild/interpreter/type_checking.py