fn __pop_Variant21(
    __symbols: &mut Vec<(LexerPosition, __Symbol, LexerPosition)>,
) -> (LexerPosition, Vec<Initializer>, LexerPosition)fn __pop_Variant21(
    __symbols: &mut Vec<(LexerPosition, __Symbol, LexerPosition)>,
) -> (LexerPosition, Vec<Initializer>, LexerPosition)