Fix codehash for EOA's and FixedBytes in sol_interface!

stylus-proc/src/types.rs

@@ -82,7 +82,7 @@ pub fn solidity_type_info(ty: &Type) -> (Cow<'static, str>, Cow<'static, str>) {
         Type::String(_) => simple!(String),
         Type::Bytes(_) => simple!(Bytes),
         Type::FixedBytes(_, size) => (
-            "stylus_sdk::abi::FixedBytesSolType<{size}>".into(),
+            format!("stylus_sdk::abi::FixedBytesSolType<{size}>").into(),
             abi!("bytes[{size}]"),
         ),
         Type::Uint(_, size) => {

stylus-sdk/src/types.rs

@@ -14,17 +14,22 @@
 //! ```
 
 use crate::hostio;
-use alloy_primitives::{Address, B256, U256};
+use alloy_primitives::{b256, Address, B256, U256};
 
 /// Trait that allows the [`Address`] type to inspect the corresponding account's balance and codehash.
 pub trait AddressVM {
     /// The balance in wei of the account.
     fn balance(&self) -> U256;
 
-    /// The codehash of the contract at the given address, or `None` when an [`EOA`].
+    /// The codehash of the contract or [`EOA`] at the given address.
     ///
     /// [`EOA`]: https://ethereum.org/en/developers/docs/accounts/#types-of-account
-    fn codehash(&self) -> Option<B256>;
+    fn codehash(&self) -> B256;
+
+    /// Determines if an account is an [`EOA`].
+    ///
+    /// [`EOA`]: https://ethereum.org/en/developers/docs/accounts/#types-of-account
+    fn is_eoa(&self) -> bool;
 }
 
 impl AddressVM for Address {
@@ -34,9 +39,15 @@ impl AddressVM for Address {
         U256::from_be_bytes(data)
     }
 
-    fn codehash(&self) -> Option<B256> {
+    fn codehash(&self) -> B256 {
         let mut data = [0; 32];
         unsafe { hostio::account_codehash(self.0.as_ptr(), data.as_mut_ptr()) };
-        (data != [0; 32]).then_some(data.into())
+        data.into()
+    }
+
+    fn is_eoa(&self) -> bool {
+        let hash = self.codehash();
+        hash.is_zero()
+            || hash == b256!("c5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470")
     }
 }