ZEND_AST_UNSET   1233 Zend/zend_ast.c 		case ZEND_AST_UNSET:
ZEND_AST_UNSET   7017 Zend/zend_compile.c 		case ZEND_AST_UNSET:
ZEND_AST_UNSET    472 Zend/zend_language_parser.y 		variable { $$ = zend_ast_create(ZEND_AST_UNSET, $1); }