Lintian tag information: empty-rust-library-declares-provides (type: error)

Description (from lintian-explain-tags)

For some time, Rust libraries used empty installation packages with long
Provides lines in their control files to deal with peculiarities in Rust
packaging. It is no longer considered acceptable because it strains our
archive infrastructure.

Rust packages should not be empty and merely declare a Provides control
field. Instead, please merge such packages into the main installation
package. When using debcargo, this can usually be achieved by adding
collapse_features = true to the debcargo.toml file.

You can see some examples here:

- https://sources.debian.org/src/rust-dbus/0.9.0-2/debian/control/
- https://sources.debian.org/src/rust-x11rb/0.7.0-1/debian/control/

The decision to burden the Rust packaging team with that extra step was
made after weighing all possible alternatives.

Please refer to Bug#942898, Bug#945542, and
http://meetbot.debian.net/debian-rust/2020/debian-rust.2020-10-28-18.58.log.html#l-150
for details.

Visibility: error
Show-Always: no
Check: languages/rust

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