Unresolved import when trying to use impl_header!

[mhristache]

I am trying to implement a custom HTTP header using impl_header macro from hyper crate but it seems it cannot resolve the hyper::header module.

Here is my code:

#[macro_use] extern crate hyper;

use hyper::header;

struct CustomHeader(String);
impl_header!(CustomHeader, "name", String);

And here is the compiler error:

<hyper macros>:11:14: 11:20 error: unresolved import `header::HeaderFormat`. Maybe a missing `extern crate header`?
<hyper macros>:11 Result { use header:: HeaderFormat ; self . fmt_header ( f ) } } }
                           ^~~~~~
<hyper macros>:1:1: 11:67 note: in expansion of impl_header!
lib.rs:4:1: 4:45 note: expansion site
error: aborting due to previous error
Could not compile `macro_issue`.

[seanmonstar]

Tried against master? I think a fix for this was merged in this morning (so
hasn't been published via cargo yet).

On Tue, Feb 17, 2015, 12:34 PM maximih notifications@github.com wrote:

I am trying to implement a custom HTTP header using impl_header macro from
hyper crate but it seems it cannot resolve the hyper::header module.

Here is my code:

#[macro_use] extern crate hyper;

use hyper::header;

struct CustomHeader(String);
impl_header!(CustomHeader, "name", String);

And here is the compiler error:

:11:14: 11:20 error: unresolved import header::HeaderFormat. Maybe a missing extern crate header?
:11 Result { use header:: HeaderFormat ; self . fmt_header ( f ) } } }
^~~~~~
:1:1: 11:67 note: in expansion of impl_header!
lib.rs:4:1: 4:45 note: expansion site
error: aborting due to previous error
Could not compile macro_issue.

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[mhristache]

Seems parts of it was fixed on master but there is one issue left (check use header::HeaderFormat; below) causing the whole macro to fail:

    impl ::std::fmt::Display for $from {
        fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
            use header::HeaderFormat;
            self.fmt_header(f)
        }
    }

<hyper macros>:11:14: 11:20 error: unresolved import `header::HeaderFormat`. Maybe a missing `extern crate header`?
<hyper macros>:11 Result { use header:: HeaderFormat ; self . fmt_header ( f ) } } }

[naps62]

I'm getting the exact same issue. Also tried against master, resulting in the same partial fix