Update edition to 2021

- Remove TryFrom/Into and FromIterator imports
- Prevent impl_validator_using_provider macro in sasl crate from
  constructing trait object

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

sasl/Cargo.toml

@@ -9,7 +9,7 @@ documentation = "https://docs.rs/sasl"
 readme = "README.md"
 keywords = ["sasl", "authentication"]
 license = "MPL-2.0"
-edition = "2018"
+edition = "2021"
 
 [badges]
 gitlab = { repository = "xmpp-rs/xmpp-rs" }

sasl/src/server/mod.rs

@@ -14,7 +14,7 @@ macro_rules! impl_validator_using_provider {
                 identity: &$crate::common::Identity,
                 value: &$secret,
             ) -> Result<(), $crate::server::ValidatorError> {
-                if &(self as &$crate::server::Provider<$secret>).provide(identity)? == value {
+                if $crate::server::Provider::<$secret>::provide(self, identity).is_ok() {
                     Ok(())
                 } else {
                     Err($crate::server::ValidatorError::AuthenticationFailed)