Casted variable declarations for 'if (v is! Type)' should be declared after IfStatement.

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 df444d29ad03333c0ae31f93f21c6e2c88cfd1cb..52764fe41f8738b065886b262c6827cfc910f4aa 100644
--- a/pkg/analysis_server/test/services/correction/assist_test.dart
+++ b/pkg/analysis_server/test/services/correction/assist_test.dart
@@ -1576,7 +1576,7 @@ main(p) {
     assertNoAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE);
   }
 
-  void test_introduceLocalTestedType_OK_if() {
+  void test_introduceLocalTestedType_OK_if_is() {
     resolveTestUnit('''
 class MyTypeName {}
 main(p) {
@@ -1604,6 +1604,34 @@ main(p) {
     assertHasAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
   }
 
+  void test_introduceLocalTestedType_OK_if_isNot() {
+    resolveTestUnit('''
+class MyTypeName {}
+main(p) {
+  if (p is! MyTypeName) {
+    return;
+  }
+}
+''');
+    String expected = '''
+class MyTypeName {}
+main(p) {
+  if (p is! MyTypeName) {
+    return;
+  }
+  MyTypeName myTypeName = p;
+}
+''';
+    assertHasAssistAt(
+        'is! MyType', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
+    _assertLinkedGroup(change.linkedEditGroups[0], [
+      'myTypeName = '
+    ], expectedSuggestions(
+        LinkedEditSuggestionKind.VARIABLE, ['myTypeName', 'typeName', 'name']));
+    // another good location
+    assertHasAssistAt('if (p', AssistKind.INTRODUCE_LOCAL_CAST_TYPE, expected);
+  }
+
   void test_introduceLocalTestedType_OK_while() {
     resolveTestUnit('''
 main(p) {