Allow %prec with %empty
#744
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Example: ``` %prec PREC_ARROW_FUNCTION %empty ``` Refs: https://github.com/php/php-src/blob/914f9ad49be800e887b4c5df637ff9af02eb5eeb/Zend/zend_language_parser.y#L1418 Before: ``` ❯ lrama Zend/zend_language_parser.y Zend/zend_language_parser.y:1418:27: parse error on value "%empty" ("%empty") %prec PREC_ARROW_FUNCTION %empty ^^^^^^ ``` After: ``` ❯ lrama Zend/zend_language_parser.y => No Error
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Refs: https://github.com/php/php-src/blob/914f9ad49be800e887b4c5df637ff9af02eb5eeb/Zend/zend_language_parser.y#L1418
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After: