Doc tests are no longer passed dev-dependencies

[daboross]

Previously, any doc tests run would have access to dependencies listed in the dev-dependencies section. However, cargo no longer passes any of the dev-dependencies to rustdoc.

This broke somewhere between the 2015-03-31 nightly and the 2015-04-01 nightly (72f2af1...84d6d2c).

When running on the 2015-03-31 cargo, this is the command passed to rustdoc (shown via --verbose):

rustdoc --test /home/daboross/testtest/src/lib.rs --crate-name testtest -L /home/daboross/testtest/target/debug -L /home/daboross/testtest/target/debug/deps --extern testtest=/home/daboross/testtest/target/debug/libtesttest-bdababdfeee27a0f.rlib --extern regex=/home/daboross/testtest/target/debug/deps/libregex-d1f533f77c53e903.rlib

With the newer nightly, this is passed:

rustdoc --test /home/daboross/testtest/src/lib.rs --crate-name testtest -L dependency=/home/daboross/testtest/target/debug/deps --extern testtest=/home/daboross/testtest/target/debug/libtesttest-bdababdfeee27a0f.rlib

The test was done with a simple project, with no dependencies and with the regex crate as a dev-dependency.

Cargo.toml:

[package]
name = "testtest"
version = "0.0.1"
authors = ["Dabo Ross <daboross@daboross.net>"]

[dev-dependencies]
regex = "0.1.*"

lib.rs:

//! ```rust
//! extern crate regex;
//! ```

#[test]
fn it_works() {
}