rust - Issue when replacing a crates dependency with a local version -

so trying serialize struct using bincode following these instructions, , able work.

but wanted serialize struct ipaddr enum. since ipaddr doesn't implement encodable trait needed, downloaded rustc_serialize crate git , implemented encodable ipaddr myself. changed cargo.toml file to:

[dependencies] # rustc-serialize = "0.3" byteorder = "0.3" bincode = "0.4"  [dependencies.rustc-serialize] path = "src/rustc-serialize-master" 

but now, same code struct using doesn't compile saying rustc_serialize::serialize::encodable not implemented struct though have #[derive(rustcencodable)] above struct.

even when rid of code added local version of rustc_serialize, still error.

i think might due being screwed way bincode , local rustc_serialize interact, i'm not sure.

please review cargo documentation on overriding dependencies:

to specify overrides, create .cargo/config file in ancestor of project's directory (common places put in root of code directory or in home directory).

inside file, put this:

paths = ["/path/to/project/rand"] 

going deeper, running issue 22750 - 2 different versions of crate interacting leads unhelpful error messages. when add rustc-serialize dependencies, aren't replacing old version, adding new one.

in general, feature. if project relies on crates , b , both rely on crate z different versions, rust can handle fine. problem arises when re-export items crates.