Static and top-level methods can be compile time constants.

tests/language/methods_as_constants_test.dart

+// Copyright (c) 2012, 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.
+
+topLevelMethod() => 't';
+
+const topLevelFieldForTopLevelMethod = topLevelMethod;
+const topLevelFieldForStaticMethod = A.staticMethod;
+
+class A {
+  final Function closure;
+  const A(this.closure);
+  const A.defaultTopLevel([this.closure = topLevelMethod]);
+  const A.defaultStatic([this.closure = staticMethod]);
+  const A.defaultStatic2([this.closure = A.staticMethod]);
+  run() => closure();
+
+  static staticMethod() => 's';
+  static const staticFieldForStaticMethod = staticMethod;
+  static const staticFieldForTopLevelMethod = topLevelMethod;
+}
+
+main() {
+  Expect.equals('t', (const A(topLevelMethod)).run());
+  Expect.equals('s', (const A(A.staticMethod)).run());
+  Expect.equals('t', (const A.defaultTopLevel()).run());
+  Expect.equals('s', (const A.defaultStatic()).run());
+  Expect.equals('s', (const A.defaultStatic2()).run());
+  Expect.equals('t', (new A.defaultTopLevel()).run());
+  Expect.equals('s', (new A.defaultStatic()).run());
+  Expect.equals('s', (new A.defaultStatic2()).run());
+  Expect.equals('t', topLevelFieldForTopLevelMethod());
+  Expect.equals('s', topLevelFieldForStaticMethod());
+  Expect.equals('t', A.staticFieldForTopLevelMethod());
+  Expect.equals('s', A.staticFieldForStaticMethod());
+
+  var map = const {'t': topLevelMethod, 's': A.staticMethod };
+  Expect.equals('t', map['t']());
+  Expect.equals('s', map['s']());
+}