add a sandbox file to replace in-code Rust string

sandbox.ld

@@ -0,0 +1,29 @@
+let test = 2
+
+& loop ([1, 2, 3]) with {
+& 	([]) -> false
+& 	([x]) -> eq? (x, test)
+& 	([x, ...xs]) -> {
+& 		let foo = :bar
+& 		when {
+& 			eq? (x, test) -> true
+& 			:else -> recur (xs)
+& 		}
+& 	}
+& }
+
+fn not {
+    (false) -> true
+    (nil) -> true
+    (_) -> false
+}
+
+loop ([1, 2, 3]) with {
+	([]) -> false
+	([x]) -> eq? (x, test)
+	([x, ...xs]) -> if not (eq? (x, test))
+		then recur (xs)
+		else true
+	
+}
+