display trait is added

src/protobuf/rpc.rs

@@ -1,3 +1,4 @@
+use std::fmt;
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct Error {
   #[prost(int32, tag = "1")]
@@ -7,3 +8,13 @@ pub struct Error {
   #[prost(bytes = "vec", optional, tag = "3")]
   pub data: ::core::option::Option<::prost::alloc::vec::Vec<u8>>,
 }
+
+impl fmt::Display for Error {
+  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+    write!(
+      f,
+      "Error code: {}, message: {:?}, data: {:?}",
+      self.code, self.message, self.data
+    ) // user-facing output
+  }
+}