fixes 5515

rlerdorf · rlerdorf · commit 6ce7544e7de9 · 2026-04-03T08:59:45.000-04:00
diff --git a/src/Phan/Language/UnionType.php b/src/Phan/Language/UnionType.php
@@ -3727,6 +3727,10 @@ private static function castTypeListToClassString(array $type_set): array
         $result = [];
         $is_possibly_string = false;
         foreach ($type_set as $type) {
+            if ($type instanceof ClassStringType) {
+                $result[] = $type->withIsNullable(false);
+                continue;
+            }
             if ($type instanceof LiteralStringType) {
                 if (!\preg_match(FullyQualifiedClassName::VALID_CLASS_REGEX, $type->getValue()) && !\preg_match('/^\\\\?oci-(lob|collection)$/iD', $type->getValue())) {
                     continue;
