Properly parse friendly stack traces without columns.

pkg/stack_trace/test/frame_test.dart

 // 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.
 
 library frame_test;
 
 import 'package:path/path.dart' as path;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/unittest.dart';
 
@@ skipping 184 matching lines @@
       var frame = new Frame.parseFirefox(
           '.foo(12, "@)()/<")/.fn<@'
           'http://pub.dartlang.org/stuff.dart.js:560');
       expect(frame.uri,
           equals(Uri.parse("http://pub.dartlang.org/stuff.dart.js")));
       expect(frame.line, equals(560));
       expect(frame.column, isNull);
       expect(frame.member, equals("foo.<fn>"));
     });
 
+    test('parses a deeply-nested anonymous stack frame with parameters '
+        'correctly', () {
+      var frame = new Frame.parseFirefox(
+          '.convertDartClosureToJS/\$function</<@'
+          'http://pub.dartlang.org/stuff.dart.js:560');
+      expect(frame.uri,
+          equals(Uri.parse("http://pub.dartlang.org/stuff.dart.js")));
+      expect(frame.line, equals(560));
+      expect(frame.column, isNull);
+      expect(frame.member, equals("convertDartClosureToJS.<fn>.<fn>"));
+    });
+
     test('throws a FormatException for malformed frames', () {
       expect(() => new Frame.parseFirefox(''), throwsFormatException);
       expect(() => new Frame.parseFirefox('.foo'), throwsFormatException);
       expect(() => new Frame.parseFirefox('.foo@dart:async/future.dart'),
           throwsFormatException);
       expect(() => new Frame.parseFirefox('.foo(@dart:async/future.dart:10'),
           throwsFormatException);
       expect(() => new Frame.parseFirefox('@dart:async/future.dart'),
           throwsFormatException);
     });
@@ skipping 101 matching lines @@
           equals('http://dartlang.org/thing.dart 5:10 in Foo'));
     });
 
     test('converts "<anonymous closure>" to "<fn>"', () {
       expect(new Frame.parseVM('#0 Foo.<anonymous closure> '
               '(dart:core/uri.dart:5:10)').toString(),
           equals('dart:core/uri.dart 5:10 in Foo.<fn>'));
     });
   });
 }