body.rs

use rustc_serialize::json::{Json,Decoder};
use rustc_serialize::Decodable;
use std::io::Read;

pub fn parse<T: Read, R: Decodable, E>(mut r: T) -> Result<R, E> {
  let item = try!(Json::from_reader(&mut r));

  let mut decoder = Decoder::new(item);
  let result: R = try!(Decodable::decode(&mut decoder));
  Ok(result)
}

output.txt

<std macros>:6:1: 6:32 error: the trait `core::convert::From<rustc_serialize::json::ParserError>` is not implemented for the type `E` [E0277]
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<std macros>:1:1: 6:48 note: in expansion of try!
src/github/body.rs:6:14: 6:45 note: expansion site
<std macros>:6:1: 6:32 error: the trait `core::convert::From<rustc_serialize::json::DecoderError>` is not implemented for the type `E` [E0277]
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<std macros>:1:1: 6:48 note: in expansion of try!
src/github/body.rs:9:19: 9:56 note: expansion site
error: aborting due to 2 previous errors