fn __pop_Variant18(
    __symbols: &mut Vec<(LexerPosition, __Symbol, LexerPosition)>,
) -> (LexerPosition, Option<PreprocessorExtensionBehavior>, LexerPosition)fn __pop_Variant18(
    __symbols: &mut Vec<(LexerPosition, __Symbol, LexerPosition)>,
) -> (LexerPosition, Option<PreprocessorExtensionBehavior>, LexerPosition)