chore: some no-std touchups (#9480)

crates/primitives/src/transaction/eip1559.rs

@@ -4,6 +4,9 @@ use alloy_rlp::{length_of_length, Decodable, Encodable, Header};
 use core::mem;
 use reth_codecs::{main_codec, Compact};
 
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 /// A transaction with a priority fee ([EIP-1559](https://eips.ethereum.org/EIPS/eip-1559)).
 #[main_codec]
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Default)]

crates/primitives/src/transaction/eip2930.rs

@@ -4,6 +4,9 @@ use alloy_rlp::{length_of_length, Decodable, Encodable, Header};
 use core::mem;
 use reth_codecs::{main_codec, Compact};
 
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 /// Transaction with an [`AccessList`] ([EIP-2930](https://eips.ethereum.org/EIPS/eip-2930)).
 #[main_codec]
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Default)]

crates/primitives/src/transaction/eip7702.rs

@@ -2,8 +2,11 @@ use super::access_list::AccessList;
 use crate::{keccak256, Bytes, ChainId, Signature, TxKind, TxType, B256, U256};
 use alloy_eips::eip7702::SignedAuthorization;
 use alloy_rlp::{length_of_length, Decodable, Encodable, Header};
+use core::mem;
 use reth_codecs::{main_codec, Compact};
-use std::mem;
+
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
 
 /// [EIP-7702 Set Code Transaction](https://eips.ethereum.org/EIPS/eip-7702)
 ///
@@ -306,7 +309,7 @@ impl<'a> arbitrary::Arbitrary<'a> for TxEip7702 {
 }
 
 // TODO(onbjerg): This is temporary until we upstream `Hash` for EIP-7702 types in alloy
-impl std::hash::Hash for TxEip7702 {
+impl core::hash::Hash for TxEip7702 {
     fn hash<H: core::hash::Hasher>(&self, state: &mut H) {
         self.chain_id.hash(state);
         self.nonce.hash(state);

crates/primitives/src/transaction/legacy.rs

@@ -3,6 +3,9 @@ use alloy_rlp::{length_of_length, Encodable, Header};
 use core::mem;
 use reth_codecs::{main_codec, Compact};
 
+#[cfg(not(feature = "std"))]
+use alloc::vec::Vec;
+
 /// Legacy transaction.
 #[main_codec]
 #[derive(Debug, Clone, PartialEq, Eq, Hash, Default)]