fix: upgrade to Rust 1.77.0

flake.nix

@@ -42,7 +42,7 @@
 
       rustStable = (import fenix {inherit pkgs;}).fromToolchainFile {
         file = ./rust-toolchain.toml;
-        sha256 = "sha256-e4mlaJehWBymYxJGgnbuCObVlqMlQSilZ8FljG9zPHY=";
+        sha256 = "sha256-+syqAd2kX8KVa8/U2gz3blIQTTsYYt3U63xBWaGOSc8=";
       };
 
       craneLib = (crane.mkLib pkgs).overrideToolchain rustStable;

rust-toolchain.toml

@@ -1,5 +1,5 @@
 [toolchain]
-channel = "1.76.0"
+channel = "1.77.0"
 components = ["clippy", "rustfmt", "rust-src"]
 targets = ["x86_64-unknown-linux-gnu"]
 profile = "minimal"

src/main.rs

@@ -41,7 +41,7 @@ fn main() -> Result<()> {
         let write_file = File::create(val).unwrap();
         let mut writer = BufWriter::new(&write_file);
         match write!(&mut writer, "{contents}") {
-            Ok(_) => {}
+            Ok(()) => {}
             Err(e) => eprintln!("{e}"),
         };
     } else {
@@ -55,8 +55,7 @@ fn parse_sources_config_file(filepath: &str) -> HashMap<String, Source> {
     if let Ok(file) = File::open(filepath) {
         BufReader::new(file)
             .lines()
-            .filter(std::result::Result::is_ok)
-            .map(std::result::Result::unwrap)
+            .map_while(Result::ok)
             .for_each(|line| {
                 let vec: Vec<&str> = line.split('|').collect();
                 list.insert(