Rename old_constant to existing_constant

Author: sj-i

Zend/zend_inheritance.c

@@ -2231,15 +2231,15 @@ static bool do_trait_constant_check(zend_class_entry *ce, zend_class_constant *t
 		return true;
 	}
 
-	zend_class_constant *old_constant = Z_PTR_P(zv);
+	zend_class_constant *existing_constant = Z_PTR_P(zv);
 
-	if ((ZEND_CLASS_CONST_FLAGS(trait_constant) & flags_mask) == (ZEND_CLASS_CONST_FLAGS(old_constant) & flags_mask)) {
-		is_compatible = check_trait_property_or_constant_value_compatibility(ce, &trait_constant->value, &old_constant->value);
+	if ((ZEND_CLASS_CONST_FLAGS(trait_constant) & flags_mask) == (ZEND_CLASS_CONST_FLAGS(existing_constant) & flags_mask)) {
+		is_compatible = check_trait_property_or_constant_value_compatibility(ce, &trait_constant->value, &existing_constant->value);
 	}
 	if (!is_compatible) {
 		zend_error_noreturn(E_COMPILE_ERROR,
 			"%s and %s define the same constant (%s) in the composition of %s. However, the definition differs and is considered incompatible. Class was composed",
-			ZSTR_VAL(find_first_constant_definition(ce, traits, current_trait, name, old_constant->ce)->name),
+			ZSTR_VAL(find_first_constant_definition(ce, traits, current_trait, name, existing_constant->ce)->name),
 			ZSTR_VAL(trait_constant->ce->name),
 			ZSTR_VAL(name),
 			ZSTR_VAL(ce->name));