error message for type mismatch in macro does not reveal location of macro expansion

[oli-obk]

Playpen: http://is.gd/izhPM3

use std::io::IoError;
use std::error::FromError;

enum MyError {
    IoError(std::io::IoError),
    OtherError
}

impl FromError<std::io::IoError> for MyError {
    fn from_error(err: std::io::IoError) -> MyError {
        MyError::IoError(err);
    }
}

fn somefun() -> Result<(), MyError>
{
    let mut w = Vec::new();
    write!(&mut w, "test")
}

fn main() {
}

yields

<std macros>:4:9: 5:6 error: mismatched types: expected `core::result::Result<(), MyError>`, found `core::result::Result<(), std::io::IoError>` (expected enum MyError, found struct std::io::IoError)
<std macros>:4         format_args!(|args| { dst.write_fmt(args) }, $($arg)*)
<std macros>:5     })

neither location nor name of the macro is shown. Also the location of the invokation is missing.

[ftxqxd]

This now gives:

<std macros>:2:8: 2:54 error: type `&mut collections::vec::Vec<_>` does not implement any method in scope named `write_fmt`
<std macros>:2 $ dst . write_fmt ( format_args ! ( $ ( $ arg ) * ) ) )
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<std macros>:1:1: 2:56 note: in expansion of write!
<anon>:18:5: 18:27 note: expansion site

Which is much better: it shows both the location of the invocation and the name of the macro.

[oli-obk]

Lgtm