[Pkg-rust-maintainers] Bug#1016808: debcargo does not handle extra features for dev-dependencies declared in the features section.

[Peter Michael Green]

Package: debcargo
Version: 2.5.0-3

Alexander Kjäll was working on packaging wl-clipboard-rs when he ran 
into an autopkgtest failure.
> debian cargo wrapper: options, profiles, parallel: ['parallel=4'] [] ['-j4']
> debian cargo wrapper: rust_type, gnu_type: x86_64-unknown-linux-gnu, x86_64-linux-gnu
> debian cargo wrapper: linking /usr/share/cargo/registry/* into /tmp/tmp.Zo0aVr3cJs/registry/
> debian cargo wrapper: options, profiles, parallel: ['parallel=4'] [] ['-j4']
> debian cargo wrapper: rust_type, gnu_type: x86_64-unknown-linux-gnu, x86_64-linux-gnu
> debian cargo wrapper: running subprocess (['env', 'RUST_BACKTRACE=1', '/usr/bin/cargo', '-Zavoid-dev-deps', 'test', '--verbose', '--verbose', '-j4', '--target', 'x86_64-unknown-linux-gnu', '--all-targets', '--no-default-features', '--features', 'native_lib'],) {}
> error: no matching package named `parking_lot` found
> location searched: registry `crates-io`
> required by package `wayland-server v0.29.4`
>      ... which satisfies dependency `wayland-server = "^0.29.4"` of package `wl-clipboard-rs v0.6.0 (/usr/share/cargo/registry/wl-clipboard-rs-0.6.0)`

Investigating showed that Cargo.toml contains the following

> [dev-dependencies.wayland-server]
> version = "0.29.4"
>
> [features]
> dlopen = ["native_lib", "wayland-client/dlopen", "wayland-server/dlopen"]
> native_lib = ["wayland-client/use_system_lib", 
> "wayland-server/use_system_lib"]
If I am reading this correctly this means that when running tests with 
the "native_lib" feature enabled, the "use_system_lib" feature of the 
wayland-server package will be enabled.

However debcargo does not generate a test dependency on 
librust-wayland-server+use-system-lib-dev

I believe this is the result of the error Alexander encountered (and I 
reproduced)

The packaging for wl-clipboard-rs ia available in the 
WIP-wl-clipboard-rs branch of debcargo-conf.
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