Missing support for build-dependencies

[jocutajar]

• What are you trying to do?

Depend on a dependency that has a build-dependency. Package A has build-dependency on bindgen from crates.io. Package A can be published to nexus just fine. Package B depends on A. Publishing package A ends up in error:

error[E0432]: unresolved import bindgen
and
use of undeclared crate or module bindgen

• How could we solve this issue? (Not knowing is okay!)

It seems the build dependencies are silently converted to normal dependencies. The relevant kind field is hard-coded here -

nexus-repository-cargo/src/main/java/org/sonatype/nexus/plugins/cargo/registry/CargoRegistryFacetImpl.java

Line 204 in 57760b6

obj.addProperty("kind", "normal");

Cloning the index I get:

{
    ...
    "deps": [
        {
            "name": "bindgen",
            "req": "^0.69",
            "features": [],
            "optional": false,
            "default_features": true,
            "kind": "normal",
            "registry": "https://github.com/rust-lang/crates.io-index"
        }
    ],
}

Instead, the dependency kind should be tracked from submission and reproduced in the index.