rust-lang/cargo — pull request #285 by alexcrichton (2014-07-29 03:11:14+00:00)
Title: Don't blow away target/doc

The existing rustdoc behavior for working with an already-present directory is
good enough, so there's no need for cargo to help out by blowing things away.
This also makes the copy-back portion easier by just not having it.

Closes #284