feat(core): add `strum::EnumIter` and `strum::EnumCount` to `Chain` (#2043)

* add strum EnumIter and EnumCount to Chain

* clippy

ethers-core/src/types/chain.rs

@@ -5,7 +5,7 @@ use std::{
     fmt,
     time::Duration,
 };
-use strum::{AsRefStr, EnumString, EnumVariantNames};
+use strum::{AsRefStr, EnumCount, EnumIter, EnumString, EnumVariantNames};
 
 // compatibility re-export
 #[doc(hidden)]
@@ -33,6 +33,8 @@ pub type ParseChainError = TryFromPrimitiveError<Chain>;
     AsRefStr,         // also for fmt::Display and serde::Serialize
     EnumVariantNames, // Self::VARIANTS
     EnumString,       // FromStr, TryFrom<&str>
+    EnumIter,
+    EnumCount,
     TryFromPrimitive, // TryFrom<u64>
     Deserialize,
 )]
@@ -372,9 +374,15 @@ impl Chain {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use strum::IntoEnumIterator;
 
     #[test]
     fn test_default_chain() {
         assert_eq!(serde_json::to_string(&Chain::default()).unwrap(), "\"mainnet\"");
     }
+
+    #[test]
+    fn test_enum_iter() {
+        assert_eq!(Chain::COUNT, Chain::iter().size_hint().0);
+    }
 }

ethers-solc/src/sourcemap.rs

@@ -512,7 +512,7 @@ mod tests {
         let source_maps = include_str!("../test-data/out-source-maps.txt");
 
         for (line, s) in source_maps.lines().enumerate() {
-            parse(s).unwrap_or_else(|_| panic!("Failed to parse line {}", line));
+            parse(s).unwrap_or_else(|_| panic!("Failed to parse line {line}"));
         }
     }
 

ethers-solc/src/utils.rs

@@ -506,7 +506,7 @@ mod tests {
         let existing = path.join("Test.sol");
         let non_existing = path.join("test.sol");
         std::fs::write(
-            &existing,
+            existing,
             r#"
 pragma solidity ^0.8.10;
 contract A {}

examples/providers/examples/retry.rs

@@ -19,7 +19,7 @@ async fn main() -> eyre::Result<()> {
         .rate_limit_retries(10)
         .timeout_retries(3)
         .initial_backoff(Duration::from_millis(500))
-        .build(provider, Box::new(HttpRateLimitRetryPolicy::default()));
+        .build(provider, Box::<ethers::providers::HttpRateLimitRetryPolicy>::default());
 
     // Send a JSON-RPC request for the latest block
     let block_num = "latest".to_string();