fix: compatible with derive_more 2.1.0

The derive_more 2.1.0 release includes a fix for 'Missing trait bounds in
AsRef/AsMut derives when associative types are involved' (#474).

This fix adds additional where clauses to the generated impl blocks that
require GenericArray to implement AsRef for itself, which it doesn't.

Replace the derived AsRef with a manual implementation to avoid the
trait bound issue while maintaining the same functionality.

Author: jdx

Cargo.lock

@@ -23,7 +23,7 @@ chrono = { version = "0.4", features = ["serde"] }
 clap = { version = "4", features = ["derive"] }
 console = "0.15"
 ctrlc = "3"
-derive_more = { version = "2.0", features = ["display", "from", "deref", "deref_mut", "into", "as_ref"] }
+derive_more = { version = "2.1", features = ["display", "from", "deref", "deref_mut", "into", "as_ref"] }
 directories = "6"
 generic-array = "0.14"
 hex = "0.4"

Cargo.toml

@@ -1,17 +1,22 @@
 use std::str::FromStr;
 
 use aes_gcm::Tag;
-use derive_more::{AsMut, AsRef, From};
+use derive_more::{AsMut, From};
 use generic_array::GenericArray;
 
 use crate::*;
 
-#[derive(AsRef, AsMut, From)]
+#[derive(AsMut, From)]
 #[as_mut([u8])]
-#[as_ref[Tag<C::AuthorizationTagSize>]]
 #[impl_tools::autoimpl(Debug, PartialEq)]
 pub struct AuthorizationTag<C: Cipher>(GenericArray<u8, C::AuthorizationTagSize>);
 
+impl<C: Cipher> AsRef<Tag<C::AuthorizationTagSize>> for AuthorizationTag<C> {
+    fn as_ref(&self) -> &Tag<C::AuthorizationTagSize> {
+        &self.0
+    }
+}
+
 impl<C: Cipher> FromStr for AuthorizationTag<C> {
     type Err = Base64DecodeError;