missing note in compiler error when expanding macro

[lukaszwawrzyk]

rustc does not show where the error that happened inside a macro originates from user code.

I tried this code:

use std::path::PathBuf;

fn foo() -> PathBuf {
    try!(Err("broken"));

    unimplemented!()
}

fn main() {}

I expected to see an error that points me to a line in the file I edited, i.e. main.rs, so this is what rustc 1.8.0 would output:

<std macros>:5:8: 6:42 error: mismatched types:
 expected `std::path::PathBuf`,
    found `core::result::Result<_, _>`
(expected struct `std::path::PathBuf`,
    found enum `core::result::Result`) [E0308]
<std macros>:5 return $ crate:: result:: Result:: Err (
<std macros>:6 $ crate:: convert:: From:: from ( err ) ) } } )
main.rs:4:5: 4:25 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:42 help: run `rustc --explain E0308` to see a detailed explanation

The key line here is this one main.rs:4:5: 4:25 note: in this expansion of try! (defined in <std macros>) that points me to line 4.

Instead I get the message that gives me no clue about where to look

<std macros>:5:8: 6:45 error: mismatched types [E0308]
<std macros>:5 return $ crate :: result :: Result :: Err (
                      ^
<std macros>:5:8: 6:45 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:45 help: run `rustc --explain E0308` to see a detailed explanation
<std macros>:5:8: 6:45 note: expected type `std::path::PathBuf`
<std macros>:5:8: 6:45 note:    found type `std::result::Result<_, _>`

Meta

rustc 1.10.0-nightly (d91f8ab0f 2016-05-07)
binary: rustc
commit-hash: d91f8ab0f58fa123857d96b9e151fc5185f5ff08
commit-date: 2016-05-07
host: x86_64-unknown-linux-gnu
release: 1.10.0-nightly

[durka]

Hopefully fixed by #33749.

[jseyfried]

This was fixed in #33730 (landed two days ago).
@lukaszwawrzyk you should get a better error on the most recent nighties.

[lukaszwawrzyk]

Yes, I updated and I get expected result now, thank you!

<std macros>:5:8: 6:45 error: mismatched types [E0308]
<std macros>:5 return $ crate :: result :: Result :: Err (
                      ^
src/main.rs:24:5: 24:25 note: in this expansion of try! (defined in <std macros>)
<std macros>:5:8: 6:45 help: run `rustc --explain E0308` to see a detailed explanation
<std macros>:5:8: 6:45 note: expected type `std::path::PathBuf`
<std macros>:5:8: 6:45 note:    found type `std::result::Result<_, _>`