work on nested tables, will need some cleanup later

UpsilonTests/TableTests.cs

@@ -57,6 +57,27 @@ return table[""test""]
             Assert.Null(evaluated);
         }
 
+        [Fact]
+        public void NestedTables()
+        {
+            const string input = @"
+table = {
+    {
+        {
+            100, 600, 900
+        },
+        {}
+    }
+}
+return table[1][1][2]
+";
+            var script = new Script(input);
+            Assert.Empty(script.Diagnostics.Messages);
+            var evaluated = script.Evaluate<long>();
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(600, evaluated);
+        }
+
         [Fact]
         public void FunctionsInTable()
         {