[Pkg-rust-maintainers] Bug#858153: cargo: stage0 build fails

[peter green]

Package: cargo
Version: 0.15.0~dev-1

It seems that trying to do a "stage0" build of cargo no longer works. Specifically.

DEB_BUILD_PROFILES=stage0 dpkg-buildpackage -B

fails with.

Exception:
  from ./debian/bootstrap.py, line 1231:
  [Errno 2] No such file or directory: u'/cargo-0.15.0~dev/vendor/index/cr/at/crates-io'

I initially discovered this issue in a Raspbian stretch environment but I was also able to reproduce it in a Debian sid amd64 environment.