Leftover from a previous implementation
{ zval zv; zend_lex_tstring(&zv); $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, 0, $1, zend_ast_create_zval(&zv)); }
| trait_method_reference T_AS member_modifier identifier
{ $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, $3, $1, $4); }
- | trait_method_reference T_AS member_modifier %prec '+'
+ | trait_method_reference T_AS member_modifier
{ $$ = zend_ast_create_ex(ZEND_AST_TRAIT_ALIAS, $3, $1, NULL); }
;