Fix for issue 11680

tests/language/error_stacktrace_test.dart

Index: tests/language/error_stacktrace_test.dart
===================================================================
--- tests/language/error_stacktrace_test.dart	(revision 0)
+++ tests/language/error_stacktrace_test.dart	(revision 0)
@@ -0,0 +1,112 @@
+// Copyright (c) 2013, 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.
+// Dart test program for testing throw statement
+
+import "package:expect/expect.dart";
+
+class MyException {
+  const MyException(String message) : message_ = message;
+  final String message_;
+}
+
+class Helper1 {
+  static int func1() {
+    return func2();
+  }
+  static int func2() {
+    return func3();
+  }
+  static int func3() {
+    return func4();
+  }
+  static int func4() {
+    var i = 0;
+    try {
+      i = 10;
+      func5();
+    } on ArgumentError catch (e) {
+      i = 100;
+      Expect.isNotNull(e.stackTrace, "Errors need a stackTrace on throw");
+    }
+    return i;
+  }
+  static void func5() {
+    // Throw an Error.
+    throw new ArgumentError("ArgumentError in func5");
+  }
+}
+
+class Helper2 {
+  static int func1() {
+    return func2();
+  }
+  static int func2() {
+    return func3();
+  }
+  static int func3() {
+    return func4();
+  }
+  static int func4() {
+    var i = 0;
+    try {
+      i = 10;
+      func5();
+    } on ArgumentError catch (e, s) {
+      i = 200;
+      Expect.isNotNull(e.stackTrace, "Errors need a stackTrace on throw");
+      Expect.isFalse(identical(e.stackTrace, s));
+      Expect.equals(e.stackTrace.toString(), s.toString());
+    }
+    return i;
+  }
+  static List func5() {
+    // Throw an Error.
+    throw new ArgumentError("ArgumentError in func5");
+  }
+}
+
+class Helper3 {
+  static int func1() {
+    return func2();
+  }
+  static int func2() {
+    return func3();
+  }
+  static int func3() {
+    return func4();
+  }
+  static int func4() {
+    var i = 0;
+    try {
+      i = 10;
+      func5();
+    } on MyException catch (e) {
+      i = 300;
+      try {
+        // There should be no stackTrace in this normal excpetion object.
+        // We should get a NoSuchMethodError.
+        var trace = e.stackTrace;
+      } on NoSuchMethodError catch (e) {
+        Expect.isNotNull(e.stackTrace, "Error needs a stackTrace on throw");
+      }
+    }
+    return i;
+  }
+  static List func5() {
+    // Throw an Exception (any random object).
+    throw new MyException("MyException in func5");
+  }
+}
+
+class ErrorStackTraceTest {
+  static testMain() {
+    Expect.equals(100, Helper1.func1());
+    Expect.equals(200, Helper2.func1());
+    Expect.equals(300, Helper3.func1());
+  }
+}
+
+main() {
+  ErrorStackTraceTest.testMain();
+}