fix(cardano-blockchain-types): impl display for cip36 error

Signed-off-by: bkioshn <[email protected]>

Author: bkioshn

rust/cardano-blockchain-types/Cargo.toml

@@ -38,3 +38,4 @@ num-traits = "0.2.19"
 ed25519-dalek = "2.1.1"
 serde = "1.0.210"
 num-bigint = "0.4.6"
+serde_json = "1.0.134"

rust/cardano-blockchain-types/src/metadata/cip36/mod.rs

@@ -4,8 +4,7 @@ pub mod key_registration;
 pub mod registration_witness;
 mod validation;
 pub mod voting_pk;
-
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt};
 
 use catalyst_types::problem_report::ProblemReport;
 use ed25519_dalek::VerifyingKey;
@@ -54,6 +53,19 @@ pub struct Cip36Error {
     report: ProblemReport,
 }
 
+impl fmt::Display for Cip36Error {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let report_json = serde_json::to_string(&self.report)
+            .unwrap_or_else(|_| String::from("Failed to serialize ProblemReport"));
+
+        write!(
+            fmt,
+            "Cip36Error {{ error: {}, report: {} }}",
+            self.error, report_json
+        )
+    }
+}
+
 impl Cip36 {
     /// Create an instance of CIP-36.
     /// The CIP-36 registration contains the key registration (61284)