[Pkg-rust-maintainers] Updating Cargo for Debian packaging?

[Josh Triplett]

Could someone please update the Cargo snapshot to a version that
includes commit db71d878fb4909575338f9f433b613ba94257d8b, from
https://github.com/rust-lang/cargo/pull/3369 ?

That change makes it possible to build packages from a directory
registry (as we'll do in Debian packaging) without having to have
packages installed for optional dependencies for non-enabled features.
Without that change, "cargo install" wants to resolve the entire
dependency graph, which can require pulling in an excessive number of
crates, including circular dependencies.

- Josh Triplett