Assert that we have an Identifier here

Author: sebastianbergmann

src/StaticAnalysis/CodeUnitFindingVisitor.php

@@ -314,6 +314,8 @@ private function unionOrIntersectionAsString(ComplexType $type): string
             if ($_type instanceof Name) {
                 $types[] = $_type->toCodeString();
             } else {
+                assert($_type instanceof Identifier);
+
                 $types[] = $_type->toString();
             }
         }