Ha, you’re right, if I put the `extern crate` in main.rs and drop the `self::`, it works. Anyway should I make an issue on github?
On Friday 5 September 2014 at 18:05, Erick Tryzelaar wrote: > Woah, this is unexpected behavior. I've slimmed down this error to: > > lib.rs (http://lib.rs): > ``` > extern crate serialize; > > struct Foo; > > impl <D: ::serialize::Decoder<E>, E> ::serialize::Decodable<D, E> for Foo { > fn decode(_d: &mut D) -> Result<Foo, E> { > fail!() > } > } > ``` > > main.rs (http://main.rs): > ``` > mod lib; > fn main() {} > ``` > > > Which errors with: > > ``` > lib.rs:5:10: 5:19 error: failed to resolve. Did you mean `self::serialize`? > lib.rs:5 (http://lib.rs:5) impl <D: ::serialize::Decoder<E>, E> > ::serialize::Decodable<D, E> for Foo { > ^~~~~~~~~ > lib.rs:5:10: 5:33 error: attempt to bound type parameter with a nonexistent > trait `serialize::Decoder` > lib.rs:5 (http://lib.rs:5) impl <D: ::serialize::Decoder<E>, E> > ::serialize::Decodable<D, E> for Foo { > ^~~~~~~~~~~~~~~~~~~~~~~ > lib.rs:5:38: 5:47 error: failed to resolve. Did you mean `self::serialize`? > lib.rs:5 (http://lib.rs:5) impl <D: ::serialize::Decoder<E>, E> > ::serialize::Decodable<D, E> for Foo { > ^~~~~~~~~ > lib.rs:5:38: 5:66 error: attempt to implement a nonexistent trait > `serialize::Decodable` > lib.rs:5 (http://lib.rs:5) impl <D: ::serialize::Decoder<E>, E> > ::serialize::Decodable<D, E> for Foo { > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ > error: aborting due to 4 previous errors > ``` > > However, if instead we use a relative path to `serialize::Decoder` and etc, > it works: > > ``` > extern crate serialize; > > struct Foo; > > impl <D: serialize::Decoder<E>, E> serialize::Decodable<D, E> for Foo { > fn decode(_d: &mut D) -> Result<Foo, E> { > fail!() > } > } > ``` > > It also works if we move the `extern crate serialize` into `main.rs > (http://main.rs)`. Since almost everyone puts the `extern crate` in the > lib.rs/main.rs (http://lib.rs/main.rs) of a project, we tend not to run into > this. I thought this used to work. Has anything recently changed in name > resolution that would have changed how how `extern crate` works with > submodules? > > > > On Fri, Sep 5, 2014 at 8:41 AM, Oldřich Vetešník <oldrich.vetes...@gmail.com > (mailto:oldrich.vetes...@gmail.com)> wrote: > > Hello all, > > > > I’m having some trouble when using external crates in a module. For example > > the following code won’t compile. > > But if I put everything in main.rs (http://main.rs) it will compile. > > (Note: the code is also here > > https://gist.github.com/ollie/90e266f4cbfcad21501d if it gets mangled along > > the way.) > > > > main.rs (http://main.rs): > > > > use lib::decode_json_file; > > > > mod lib; > > > > fn main() { > > decode_json_file(); > > } > > > > > > lib.rs (http://lib.rs): > > > > extern crate serialize; > > > > use self::serialize::json; > > // This has no effect: > > // use self::serialize::{Decodable, Decoder}; > > > > #[deriving(Show, Decodable)] > > struct Foo { > > foo: u8, > > } > > > > pub fn decode_json_file() { > > let raw_json = "{ \"foo\": 1 }"; > > > > let foo: Foo = json::decode(raw_json).unwrap(); > > > > println!("{}", foo); > > } > > > > > > When I run rustc main.rs (http://main.rs), it prints this: > > > > lib.rs:7:18: 7:27 error: failed to resolve. Did you mean `self::serialize`? > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > lib.rs:7:18: 7:27 error: attempt to bound type parameter with a nonexistent > > trait `serialize::Decoder` > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > lib.rs:7:18: 7:27 error: failed to resolve. Did you mean `self::serialize`? > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > lib.rs:7:18: 7:27 error: attempt to implement a nonexistent trait > > `serialize::Decodable` > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > lib.rs:7:18: 7:27 error: failed to resolve. Did you mean > > `self::serialize::Decodable`? > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > lib.rs:7:18: 7:27 error: unresolved name `serialize::Decodable::decode`. > > lib.rs:7 (http://lib.rs:7) #[deriving(Show, Decodable)] > > ^~~~~~~~~ > > note: in expansion of #[deriving] > > lib.rs:7:1: 7:29 note: expansion site > > error: aborting due to 6 previous errors > > > > > > Am I doing something wrong? > > > > Thank you and have a nice day, > > Ollie > > > > _______________________________________________ > > Rust-dev mailing list > > Rust-dev@mozilla.org (mailto:Rust-dev@mozilla.org) > > https://mail.mozilla.org/listinfo/rust-dev > _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
