frog: detect when getter/setter has incorrect number of arguments.

tests/language/src/GetterDeclarationNegativeTest.dart

Index: tests/language/src/GetterDeclarationNegativeTest.dart
diff --git a/tests/language/src/GetterDeclarationNegativeTest.dart b/tests/language/src/GetterDeclarationNegativeTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..813b8d3b2935107a4ec891e5d3a949b4bf629bf7
--- /dev/null
+++ b/tests/language/src/GetterDeclarationNegativeTest.dart
@@ -0,0 +1,13 @@
+// Copyright (c) 2011, 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.
+//
+// Test that a getter has no arguments
+get m(var extraParam) {
+  return null;
+}
+
+main() {
+  m;
+}
+