`std::error::Error` is not implemented for `std::sync::mpsc::RecvTimeoutError`

[twittner]

It seems that std::sync::mpsc::RecvTimeoutError is missing impls for std::fmt::Display and std::error::Error. Related error types such as std::sync::mpsc::TryRecvError implement both.

I tried this code:

use std::error::Error;
use std::sync::mpsc;
use std::time::Duration;

fn f(r: mpsc::Receiver<()>) -> Result<(), Box<Error>> {
    let _ = r.recv_timeout(Duration::from_secs(3))?;
    Ok(())
}

fn main() {
    let (_, rx) = mpsc::channel();
    let _ = f(rx);
}

I expected to see this happen: compilation succeeds

Instead, this happened:

rustc 1.14.0-nightly (3f4408347 2016-10-27)
error[E0277]: the trait bound `std::sync::mpsc::RecvTimeoutError: std::error::Error` is not satisfied
 --> <anon>:6:13
  |
6 |     let _ = r.recv_timeout(Duration::from_secs(3))?;
  |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::error::Error` is not implemented for `std::sync::mpsc::RecvTimeoutError`
  |
  = note: required because of the requirements on the impl of `std::convert::From<std::sync::mpsc::RecvTimeoutError>` for `Box<std::error::Error>`
  = note: required by `std::convert::From::from`

error: aborting due to previous error

Meta

rustc --version --verbose:

rustc 1.14.0-nightly (3f4408347 2016-10-27)
binary: rustc
commit-hash: 3f4408347d2109803edbf53c89c8bce575de4b67
commit-date: 2016-10-27
host: x86_64-unknown-linux-gnu
release: 1.14.0-nightly
LLVM version: 3.9

Backtrace: N/A