Fixed a post-fix increment issue, highlighted in the game engine

test/scripts/increment-postfix-bugfix.toy

@@ -0,0 +1,15 @@
+var a = 0;
+
+if (a++ >= 1) {
+	assert false, "increment postfix bugfix failed (first check)";
+}
+
+
+if (a++ >= 1) {
+	
+}
+
+assert a == 2, "increment postfix bugfix failed (second check)";
+
+
+print "All good";

test/test_interpreter.c

@@ -119,6 +119,7 @@ int main() {
 			"dottify-bugfix.toy",
 			"function-within-function-bugfix.toy",
 			"functions.toy",
+			"increment-postfix-bugfix.toy",
 			"index-arrays.toy",
 			"index-assignment-both-bugfix.toy",
 			"index-assignment-intermediate-bugfix.toy",