args checking

src/main.rs

@@ -35,7 +35,7 @@ fn main() {
 
     //pattern parsing
     let mul_string = format_multiline(concat!(
-        "val 0 0 255",
+        "val 0 0 255\n",
         "val r 255"
     ));
     let res: Result<Vec<Box<dyn Pattern>>, ParseError> = mul_string.iter()