Ignore 'expr is' outside of a statement.

pkg/analysis_server/test/services/correction/assist_test.dart

Index: pkg/analysis_server/test/services/correction/assist_test.dart
diff --git a/pkg/analysis_server/test/services/correction/assist_test.dart b/pkg/analysis_server/test/services/correction/assist_test.dart
index ed3d7d33153d4776f817822777a1c7b187f2ca56..859f248baa46ee16edd68594218dac0a4ccdaf93 100644
--- a/pkg/analysis_server/test/services/correction/assist_test.dart
+++ b/pkg/analysis_server/test/services/correction/assist_test.dart
@@ -2379,6 +2379,15 @@ main(p) {
     await assertNoAssistAt('if (p', DartAssistKind.INTRODUCE_LOCAL_CAST_TYPE);
   }
 
+  test_introduceLocalTestedType_BAD_notStatement() async {
+    resolveTestUnit('''
+class C {
+  bool b;
+  C(v) : b = v is int;
+}''');
+    await assertNoAssistAt('is int', DartAssistKind.INTRODUCE_LOCAL_CAST_TYPE);
+  }
+
   test_introduceLocalTestedType_OK_if_is() async {
     resolveTestUnit('''
 class MyTypeName {}