rust-toolchain: update to Rust 1.77.2

This also upgrades the dev_container to package the new Rust version.

A few final clippy fixes are included as well.

BUG=b:344974550
TEST=tools/clippy

Change-Id: Iab4253e9cd88fdae989bb5b5170040b6af85baca
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/5609084
Reviewed-by: Dennis Kempin <denniskempin@google.com>
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>

devices/src/serial.rs

@@ -251,7 +251,7 @@ impl Serial {
                                     Ok(0) => {
                                         return rx;
                                     }
-                                    Ok(_) => {
+                                    Ok(_n) => {
                                         if send_channel.send(rx_buf[0]).is_err() {
                                             // The receiver has disconnected.
                                             return rx;

devices/src/virtio/video/decoder/backend/vaapi.rs

@@ -491,6 +491,7 @@ impl<'a, T: AsBufferHandle> AsMut<[u8]> for BufferMapping<'a, T> {
 /// decoded and is waiting for us to release it (`Decoded`), or because we temporarily removed it
 /// from the decoder pool after a reset and are waiting for the client to tell us we can use it
 /// (`Held`).
+#[allow(dead_code)] // TODO: b/344974550
 enum BorrowedFrame {
     Decoded(Box<dyn DecodedHandle<Descriptor = BufferDescWithPicId>>),
     Held(Box<dyn AsRef<BufferDescWithPicId>>),

e2e_tests/fixture/src/vm.rs

@@ -269,7 +269,7 @@ impl Config {
     }
 
     pub fn with_stdout_hardware(mut self, hw_type: &str) -> Self {
-        self.console_hardware = hw_type.to_owned();
+        self.console_hardware = hw_type.into();
         self
     }
 

ext2/tests/tests.rs

@@ -266,9 +266,9 @@ fn test_file_contents() {
     let td = tempdir().unwrap();
     let dir = td.path().join("testdata");
     create_dir(&dir).unwrap();
-    let mut hello = File::create(&dir.join("hello.txt")).unwrap();
+    let mut hello = File::create(dir.join("hello.txt")).unwrap();
     hello.write_all(b"Hello!\n").unwrap();
-    let mut big = BufWriter::new(File::create(&dir.join("big.txt")).unwrap());
+    let mut big = BufWriter::new(File::create(dir.join("big.txt")).unwrap());
     let data = b"123456789\n";
     for _ in 0..1024 {
         big.write_all(data).unwrap();

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.73.0"
+channel = "1.77.2"
 components = [ "rustfmt", "clippy", "llvm-tools-preview" ]

tools/impl/dev_container/version

@@ -1 +1 @@
-r0045
+r0046