- Unused results should be marked with EXT_TYPE_UNUSED and not IS_UNUSED

Zend/zend_compile.c

@@ -320,7 +320,8 @@ void do_assign_ref(znode *result, znode *lvar, znode *rvar CLS_DC)
 		opline->result.u.var = get_temporary_variable(CG(active_op_array));
 		*result = opline->result;
 	} else {
-		SET_UNUSED(opline->result);
+		/* SET_UNUSED(opline->result); */
+		opline->result.u.EA.type |= EXT_TYPE_UNUSED;
 	}
 	opline->op1 = *lvar;
 	opline->op2 = *rvar;

Zend/zend_execute.h

@@ -216,7 +216,7 @@ ZEND_API inline void zend_assign_to_variable_reference(znode *result, zval **var
 		(*variable_ptr_ptr)->is_ref = 1;
 	}
 
-	if (result && (result->op_type != IS_UNUSED)) {
+	if (result && !(result->u.EA.type & EXT_TYPE_UNUSED)) {
 		Ts[result->u.var].var.ptr_ptr = variable_ptr_ptr;
 		SELECTIVE_PZVAL_LOCK(*variable_ptr_ptr, result);
 		AI_USE_PTR(Ts[result->u.var].var);