fix: build warnings

justfile

@@ -1,6 +1,13 @@
 lint:
     cargo clippy --all --all-features --tests -- -D warnings
 
+build:
+    cargo build
+
+test:
+    cargo test
+
 test_watch:
     git ls-files | entr cargo test
 
+pre_commit: lint test build

src/rom.rs

@@ -14,8 +14,14 @@ enum Mapper {
 
 pub struct Rom {
     pub prg_rom: Vec<u8>,
+
+    #[allow(dead_code)]
     chr_rom: Vec<u8>,
+
+    #[allow(dead_code)]
     mapper: Mapper,
+
+    #[allow(dead_code)]
     mirroring: Mirroring,
 }