added variables

tests/with_variables.sl

@@ -0,0 +1,13 @@
+import ../stdlib/stdlib.sl
+import ../stdlib/io.sl
+
+word main
+    3 4 5 6
+    with a b c d in
+        b puti cr
+        a puti cr
+        d puti cr
+        c puti cr
+    end
+    0
+end