Set up nix flake

src/main.rs

@@ -78,9 +78,9 @@ fn main() -> std::io::Result<()> {
         match args.t.as_deref() {
             Some("ba") => BAParser::parse(&mut input),
             Some("tt") => TTParser::parse(&mut input),
+            Some("mx") => panic!("Not implemented yet"),
             _ => panic!("Doesn't recognize file"),
         }
-        // parse(&mut input)
     } else if args.input.is_some() {
         // } else {
         let t = args.input.unwrap();
@@ -89,6 +89,7 @@ fn main() -> std::io::Result<()> {
         match t.split('.').last() {
             Some("ba") => BAParser::parse(&mut input),
             Some("tt") => TTParser::parse(&mut input),
+            Some("mx") => panic!("Not implemented yet"),
             _ => panic!("Doesn't recognize file"),
         }
     } else {