November 2023 - Rust Nightly Update (#413)

* Update nightly

* Replace .get(0) with .first()

* allow new clippy lint

---------

Co-authored-by: GitHub Actions <>
Co-authored-by: Luke Parker <lukeparker5132@gmail.com>

coordinator/src/tributary/mod.rs

@@ -392,7 +392,7 @@ impl ReadWrite for Transaction {
         // is impossible since we'll only read up to u16::MAX items.
         writer.write_all(&u16::try_from(shares.len()).unwrap().to_le_bytes())?;
 
-        let share_len = shares.get(0).map(|share| share.len()).unwrap_or(0);
+        let share_len = shares.first().map(|share| share.len()).unwrap_or(0);
         // For BLS12-381 G2, this would be:
         // - A 32-byte share
         // - A 96-byte ephemeral key

coordinator/tributary/src/merkle.rs

@@ -33,5 +33,5 @@ pub(crate) fn merkle(hash_args: &[[u8; 32]]) -> [u8; 32] {
     hashes = interim;
   }
 
-  hashes.get(0).copied().map(Into::into).unwrap_or(zero)
+  hashes.first().copied().map(Into::into).unwrap_or(zero)
 }