Found a compiler bug, thanks Aedan!

test/scripts/dot-modulo-bugfix.toy

@@ -0,0 +1,23 @@
+var days = [
+    "sunday",
+    "monday",
+    "tuesday",
+    "wednesday",
+    "thursday",
+    "friday",
+    "saturday"
+];
+
+var rng = 10; //for chosen at random
+
+
+var index = rng % days.length();
+
+assert index == 3, "dot modulo bugfix failed";
+
+rng %= days.length();
+
+assert rng == 3, "dot modulo assign bugfix failed";
+
+
+print "All good";

test/test_interpreter.c

@@ -114,6 +114,7 @@ int main() {
 			"dot-and-matrix.toy",
 			"dot-assignments-bugfix.toy",
 			"dot-chaining.toy",
+			"dot-modulo-bugfix.toy",
 			"dottify-bugfix.toy",
 			"functions.toy",
 			"index-arrays.toy",