Fixes issue where functions inside binary operators wouldnt work

UpsilonTests/GeneralTests/ForLoopTests.cs

@@ -115,6 +115,5 @@ return value
             Assert.Empty(script.Diagnostics.Messages);
             Assert.Equal(6, result);
         }
-
     }
 }

UpsilonTests/GeneralTests/FunctionTests.cs

@@ -198,7 +198,24 @@ end
             var result = script.EvaluateFunction<long>("add", new object[] {400, 128});
             Assert.Empty(script.Diagnostics.Messages);
             Assert.Equal(528, result);
+        }
 
+        [Fact]
+        public void HandleFunctionsInsideBinaryExpressions()
+        {
+            const string input = @"
+arr = {100, 56, 28}
+value = 0
+for key, val in arr do
+    value = value + tonumber(key)
+end
+return value
+";
+            var script = new Script(input, BoundScope, StaticScope);
+            Assert.Empty(script.Diagnostics.Messages);
+            var result = script.Evaluate<long>();
+            Assert.Empty(script.Diagnostics.Messages);
+            Assert.Equal(6, result);
         }
     }
 }