Specifiy MethodMirror.isStatic is terms of whether 'this' is permitted.

tests/lib/mirrors/local_function_is_static_test.dart

+// Copyright (c) 2014, 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 test.local_function_is_static;
+
+import 'dart:mirrors';
+import 'package:expect/expect.dart';
+
+topLevel() => 1;
+topLevelLocal() => () => 2;
+class C {
+  static klass() => 3;
+  static klassLocal() => () => 4;
+  instance() => 5;
+  instanceLocal() => () => 6;
+}
+
+main() {
+  var f = topLevel;
+  Expect.equals(1, f());
+  Expect.isTrue((reflect(f) as ClosureMirror).function.isStatic);
+
+  f = topLevelLocal();
+  Expect.equals(2, f());
+  Expect.isTrue((reflect(f) as ClosureMirror).function.isStatic);
+
+  f = C.klass;
+  Expect.equals(3, f());
+  Expect.isTrue((reflect(f) as ClosureMirror).function.isStatic);
+
+  f = C.klassLocal();
+  Expect.equals(4, f());
+  Expect.isTrue((reflect(f) as ClosureMirror).function.isStatic);
+
+  f = new C().instance;
+  Expect.equals(5, f());
+  Expect.isFalse((reflect(f) as ClosureMirror).function.isStatic);
+
+  f = new C().instanceLocal();
+  Expect.equals(6, f());
+  Expect.isFalse((reflect(f) as ClosureMirror).function.isStatic);
+}