Allow multiple errors to be mapped to single local error

[thegranddesign]

The reason I sought out this crate was because I wanted to do something like this:

::url::ParseError         => ::my_crate::errors::UrlParseError
::hyper::errors::UriError => ::my_crate::errors::UrlParseError

Unfortunately it doesn't seem like that's currently possible with this crate.

Am I missing something? If not, can it be added?

I'm thinking syntax such as:

foreign_links {
    UrlParseError(::url::ParseError, ::hyper::errors::UriError);
}

[Yamakaky]

Yeah, it's not possible for now because UrlParseError must contain an enum with the two variants.

[Lymia]

You could make a variant in errors { }, and manually write From implementations, maybe? I did that with std::sync::PoisonError (for different reasons)