Quick Fix for an undefined class in is/as expressions.

pkg/analysis_server/lib/src/services/correction/fix_internal.dart

Index: pkg/analysis_server/lib/src/services/correction/fix_internal.dart
diff --git a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
index ff9dd933ed261065750f0e040bb8c51d8079f72a..05e1e61f7e34dfd08e0dca909e3654f158f0eebf 100644
--- a/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
+++ b/pkg/analysis_server/lib/src/services/correction/fix_internal.dart
@@ -192,7 +192,9 @@ class FixProcessor {
       _addFix_createMissingOverrides(missingOverrides);
       _addFix_createNoSuchMethod();
     }
-    if (errorCode == StaticWarningCode.UNDEFINED_CLASS) {
+    if (errorCode == StaticWarningCode.CAST_TO_NON_TYPE ||
+        errorCode == StaticWarningCode.TYPE_TEST_WITH_UNDEFINED_NAME ||
+        errorCode == StaticWarningCode.UNDEFINED_CLASS) {
       _addFix_importLibrary_withType();
       _addFix_createClass();
       _addFix_undefinedClass_useSimilar();