diff --git a/VM/declaring_constructors_t02.dart b/VM/declaring_constructors_t02.dart
new file mode 100644
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+++ b/VM/declaring_constructors_t02.dart
@@ -0,0 +1,110 @@
+// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion A declaring constructor declaration is a declaration that
+/// contains a `<declaringConstructorSignature>` with a
+/// `<declaringParameterList>`, or a declaration that contains a
+/// `<declaringConstantConstructorSignature>`, or it is a
+/// `<primaryConstructorNoConst>` in the header of a class, enum, or extension
+/// type declaration, together with a declaration in the body that contains a
+/// `<declaringConstructorSignature>`.
+///
+/// @description Check that members initialized in primary initializer scope can
+/// be debugged.
+/// @author sgrekhov22@gmail.com
+
+// SharedOptions=--enable-experiment=declaring-constructors
+
+import 'dart:developer';
+import 'package:vm_service/vm_service.dart';
+
+import '../../../../pkg/vm_service/test/common/service_test_common.dart';
+import '../../../../pkg/vm_service/test/common/test_helper.dart';
+import '../Utils/expect.dart';
+
+const String shortFile = 'declaring_constructors_t03.dart';
+
+// AUTOGENERATED START
+//
+// Update these constants by running:
+//
+// dart pkg/vm_service/test/update_line_numbers.dart tests/co19/src/VM/declaring_constructors_t02.dart
+//
+const LINE_A = 41;
+const LINE_B = 44;
+const LINE_C = 48;
+const LINE_D = 49;
+const LINE_E = 50;
+// AUTOGENERATED END
+
+class C1(var String x);   // LINE_A
+
+class C2 {
+  this(final String x);   // LINE_B
+}
+
+void testeeMain() {
+  debugger();             // LINE_C
+  C1("xxx");              // LINE_D
+  C2("yyy");              // LINE_E
+}
+
+final tests = <IsolateTest>[
+  hasStoppedAtBreakpoint,
+  stoppedAtLine(LINE_C),
+  stepInto,
+  stoppedAtLine(LINE_D),
+  stepInto,
+  stoppedAtLine(LINE_A),
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    final xRef1 =
+        await service.evaluateInFrame(isolateId, 0, 'x') as InstanceRef;
+    Expect.equals("null", xRef1.valueAsString);
+    final xRef2 =
+        await service.evaluateInFrame(isolateId, 0, 'this.x') as InstanceRef;
+    Expect.equals("null", xRef2.valueAsString);
+  },
+  stepInto,
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    final xRef1 =
+        await service.evaluateInFrame(isolateId, 0, 'x') as InstanceRef;
+    Expect.equals('xxx', xRef1.valueAsString);
+    final xRef2 =
+        await service.evaluateInFrame(isolateId, 0, 'this.x') as InstanceRef;
+    Expect.equals('xxx', xRef2.valueAsString);
+  },
+  stepInto,
+  stoppedAtLine(LINE_E),
+  stepInto,
+  stoppedAtLine(LINE_B),
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    final xRef1 =
+        await service.evaluateInFrame(isolateId, 0, 'x') as InstanceRef;
+    Expect.equals("null", xRef1.valueAsString);
+    final xRef2 =
+        await service.evaluateInFrame(isolateId, 0, 'this.x') as InstanceRef;
+    Expect.equals("null", xRef2.valueAsString);
+  },
+  stepInto,
+  (VmService service, IsolateRef isolateRef) async {
+    final isolateId = isolateRef.id!;
+    final xRef1 =
+        await service.evaluateInFrame(isolateId, 0, 'x') as InstanceRef;
+    Expect.equals('yyy', xRef1.valueAsString);
+    final xRef2 =
+        await service.evaluateInFrame(isolateId, 0, 'this.x') as InstanceRef;
+    Expect.equals('yyy', xRef2.valueAsString);
+  },
+];
+
+void main([args = const <String>[]]) => runIsolateTests(
+  args,
+  tests,
+  'declaring_constructors_t02.dart',
+  pauseOnExit: true,
+  testeeConcurrent: testeeMain,
+);