Package: precious
Version: 0.1.3-2
Severity: serious
The upstream of the rust which crate dropped the optional dependency on
the rust failure crate. As a result of this the rust-which source
package no longer
builds a librust-which+failure-dev package.
The librust-which+failure-dev binary package is still present in
unstable as a
cruft package, but is uninstallable. It is completely gone from testing.
After updating the build-dependency to librust-which+default-dev
(reflecting the fact that your Cargo.toml depends on the which crate
with default features enabled), I was able to build the package succesfully.
I have not tested it though.