t.rs

// error:

error[E0277]: the trait bound `mymodule::MyHeader: mymodule::reqwest::header::Header` is not satisfied

// in crate root

#[macro_use] extern crate hyper;

// original code in mymodule using header! macro from Hyper
extern crate reqwest;
extern crate serde;
extern crate serde_json;
extern crate hyper;

header! { (MyHeader, "My-Header") => [String] }

// expands to (among other things):

pub struct MyHeader(pub String);

impl ::header::Header for MyHeader {
    fn header_name() -> &'static str {
        "My-Header"
    }
    fn parse_header(raw: &[Vec<u8>]) -> ::Result<Self> {
        ::header::parsing::from_one_raw_str(raw).map(MyHeader)
    }
}
impl ::header::HeaderFormat for MyHeader {
    fn fmt_header(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
        ::std::fmt::Display::fmt(&**self, f)
    }
}