rust-lang/cargo — pull request #799 by alexcrichton (2014-11-05 03:42:49+00:00)
Title: Build lib tests and libraries in parallel

When building unit tests for a library, we don't need the library itself to be
built beforehand, so the two can be built in parallel. If the crate takes awhile
to compile, this shows some excellent wall-time speedups.

This is temporarily rebased on #776 to build.