It's done for now

scripts/test/index-arrays.toy

@@ -26,4 +26,14 @@
 }
 
 
+//test index arithmetic
+{
+	var a = [1, 2, 3];
+
+	a[1] *= 3;
+
+	assert a == [1, 6, 3], "index arithmetic failed";
+}
+
+
 print "All good";

scripts/test/index-dictionaries.toy

@@ -18,4 +18,24 @@
 }
 
 
+//test index arithmetic
+{
+	var d = ["one":1, "two":2, "three":3];
+
+	d["three"] *= 3;
+
+	assert d == ["one":1, "two":2, "three":9], "index arithmetic failed";
+}
+
+
+//test dot arithmetic
+{
+	var d = ["one":1, "two":2, "three":3];
+
+	d.three *= 3;
+
+	assert d == ["one":1, "two":2, "three":9], "index arithmetic failed";
+}
+
+
 print "All good";