Build failing on serialise::Decoder trait

[michaeljones]

I'm getting the following error message when building:

src/lib.rs:255:1: 477:2 error: not all trait methods implemented, missing: `error` [E0046]
src/lib.rs:255 impl<'a> serialize::Decoder<IoError> for Decoder<'a> {
src/lib.rs:256     #[inline(always)]

I am very new to rust. First code written today. This patch fixes the build error but I've no idea what the correct implementation is. That IoError line is partially copied from further up the file:

diff --git a/src/lib.rs b/src/lib.rs
index 9b23b89..28e2146 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -474,6 +474,10 @@ impl<'a> serialize::Decoder<IoError> for Decoder<'a> {
         -> IoResult<T> {
             self.read_tuple_arg(idx, f)
         }
+
+    fn error(&mut self, _err: &str) -> IoError {
+        IoError{kind: InvalidInput, desc: "", detail: None}
+    }
 }

 impl<'a> serialize::Decodable<Decoder<'a>, IoError> for Value {

An example from the rust code base can be seen here:

https://github.com/rust-lang/rust/blob/5bd8edc1121a5736994d69b2dc9cf3efb6fbc116/src/libserialize/json.rs#L2076

From the commit history, it looks like it was added 3 days ago. Possibly merged even more recently.

Thanks for writing the msgpack support.

[mneumann]

Thanks! This method is new. I added it. One day we also want nicer error messages, similar to DecodeError https://github.com/rust-lang/rust/blob/5bd8edc1121a5736994d69b2dc9cf3efb6fbc116/src/libserialize/json.rs#L255.

[michaeljones]

Great, thanks :)