lrama
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A SyntaxError occurs if `lhs: %prec PREC_FOO %empty`
https://github.com/php/php-src/blob/1684c52a88d1429cf19d4927fe2edf7ff37c66be/Zend/zend_language_parser.y#L1363C1-L1365
backup_fn_flags:
%prec PREC_ARROW_FUNCTION %empty { $$ = CG(extra_fn_flags); CG(extra_fn_flags) = 0; }
;