Merge pull request #2328 from hackcraft/more_informative_match_sequence_test

More informative failure from Queryable_Tests.MatchSequencePattern()

Author: stephentoub

src/System.Linq.Expressions/tests/SequenceTests/SequenceTests.cs

@@ -1789,7 +1789,8 @@ public static void MatchSequencePattern()
                     Console.WriteLine(m);
                 }
             }
-
+            Assert.Equal(Enumerable.Empty<string>(), list.Select(mi => mi.Name));
+            Assert.Equal(Enumerable.Empty<string>(), list2.Select(mi => mi.Name));
             Assert.True(list.Count == 0 && list2.Count == 0);
         }