From 781c8ccebafac5acd02afcc75e04449c65b04d48 Mon Sep 17 00:00:00 2001
From: Yiannis Marangos <yiannis@eiger.co>
Date: Fri, 28 Jul 2023 12:37:27 +0300
Subject: [PATCH] feat: Implement `Error` for EVMError (#559)

---
 crates/primitives/src/result.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/crates/primitives/src/result.rs b/crates/primitives/src/result.rs
index ee05495c27..d38604f979 100644
--- a/crates/primitives/src/result.rs
+++ b/crates/primitives/src/result.rs
@@ -1,6 +1,7 @@
 use crate::{Log, State, B160};
 use alloc::vec::Vec;
 use bytes::Bytes;
+use core::fmt;
 use ruint::aliases::U256;
 
 pub type EVMResult<DBError> = core::result::Result<ResultAndState, EVMError<DBError>>;
@@ -128,6 +129,22 @@ pub enum EVMError<DBError> {
     Database(DBError),
 }
 
+#[cfg(feature = "std")]
+impl<DBError> std::error::Error for EVMError<DBError> where Self: fmt::Debug + fmt::Display {}
+
+impl<DBError> fmt::Display for EVMError<DBError>
+where
+    DBError: fmt::Display,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            EVMError::Transaction(v) => write!(f, "Transaction error: {:?}", v),
+            EVMError::PrevrandaoNotSet => f.write_str("Prevrandao not set"),
+            EVMError::Database(v) => write!(f, "Database error: {}", v),
+        }
+    }
+}
+
 impl<DBError> From<InvalidTransaction> for EVMError<DBError> {
     fn from(invalid: InvalidTransaction) -> Self {
         EVMError::Transaction(invalid)