Adjust context level when required before executing inlined finally clauses.

tests/language/regress_23537_test.dart

Index: tests/language/regress_23537_test.dart
diff --git a/tests/language/regress_23537_test.dart b/tests/language/regress_23537_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c8c66675761413cdbc177d1f4b7b24d066d04f17
--- /dev/null
+++ b/tests/language/regress_23537_test.dart
@@ -0,0 +1,40 @@
+// Copyright (c) 2015, 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.
+
+import 'package:expect/expect.dart';
+
+var d;
+
+test(a) {
+  while (true) {
+    try {
+      var b;
+      try {
+        for (int i = 0; i < 10; i++) {
+          // Closurizing i, a, and b, thus the return statement
+          // executes at context level 3, and the code in
+          // the finally blocks runs at context level 1 and 2.
+          return () => i + a + b;
+        }
+      } finally {
+        b = 10;
+        while (true) {
+          // Chain a new context.
+          var c = 5;
+          d = () => a + b + c;
+          break;
+        }
+      }
+    } finally {
+      a = 1;
+    }
+    break;
+  }
+}
+
+main() {
+  var c = test(0);
+  Expect.equals(11, c());
+  Expect.equals(16, d());
+}