feat: re-export rayon traits implementations (#836)

* re-export rayon traits implementations

* fix

* merge imports

Cargo.toml

@@ -101,6 +101,7 @@ pretty_assertions = "1.4"
 proptest = "1"
 proptest-derive = "0.5"
 rand = { version = "0.8", default-features = false }
+rayon = { version = "1.2", default-features = false }
 ruint = { version = "1.12.3", default-features = false, features = ["alloc"] }
 ruint-macro = { version = "1", default-features = false }
 winnow = { version = "0.6", default-features = false, features = ["alloc"] }

crates/primitives/Cargo.toml

@@ -64,6 +64,9 @@ getrandom = { workspace = true, optional = true }
 # rand
 rand = { workspace = true, optional = true, features = ["getrandom"] }
 
+# rayon
+rayon = { workspace = true, optional = true }
+
 # k256
 k256 = { workspace = true, optional = true, features = ["ecdsa"] }
 
@@ -132,7 +135,7 @@ map-fxhash = ["map", "dep:rustc-hash"]
 getrandom = ["dep:getrandom"]
 k256 = ["dep:k256"]
 rand = ["dep:rand", "getrandom", "ruint/rand", "rustc-hash?/rand"]
-rayon = ["hashbrown?/rayon", "indexmap?/rayon"]
+rayon = ["dep:rayon", "hashbrown?/rayon", "indexmap?/rayon"]
 rlp = ["dep:alloy-rlp", "ruint/alloy-rlp"]
 serde = [
     "dep:serde",

crates/primitives/src/map/mod.rs

@@ -118,6 +118,31 @@ cfg_if! {
     }
 }
 
+/// This module contains the rayon parallel iterator types for hash maps (HashMap<K, V>).
+/// You will rarely need to interact with it directly unless you have need to name one
+/// of the iterator types.
+#[cfg(feature = "rayon")]
+pub mod rayon {
+    use super::*;
+
+    cfg_if! {
+        if #[cfg(any(feature = "map-hashbrown", not(feature = "std")))] {
+            pub use hashbrown::hash_map::rayon::{
+                IntoParIter as IntoIter,
+                ParDrain as Drain,
+                ParIter as Iter,
+                ParIterMut as IterMut,
+                ParKeys as Keys,
+                ParValues as Values,
+                ParValuesMut as ValuesMut
+            };
+            use ::rayon as _;
+        } else {
+            pub use ::rayon::collections::hash_map::*;
+        }
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;