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気持ち悪い.cs

            Action<string> a = s => { };
            Action<string> b = s => { };

            var d = new Dictionary<Action<string>, string>();

            d.Add(a, "a");
            d.Add(b, "b");

            Assert.IsTrue(a.Equals(a));
            Assert.IsFalse(a.Equals(b));

            Assert.AreEqual("a", d[a]);
            Assert.AreEqual("b", d[b]);

            try
            {
                Assert.AreEqual("a", d[s => { }]);
                Assert.Fail();
            }
            catch (Exception)
            {
            }