Dependencies are pulled in even if behind a feature

[twittner]

If an optional, feature-activated dependency is also listed under dev-dependencies it will be pulled in by cargo build even without the feature being requested:

[package]
name    = "test"
version = "0.1.0"
authors = ["user@nowhere.net"]

[features]
foo = ["quickcheck"]

[dependencies.quickcheck]
optional = true

[dev-dependencies]
quickcheck = "*"

$ cargo build
   Compiling libc v0.1.8
   Compiling rand v0.3.8
   Compiling log v0.3.1
   Compiling quickcheck v0.2.20
   Compiling test v0.1.0 (file:///tmp/test)

Removing the dev-dependencies section builds the package as expected:

$ cargo clean
$ cargo build
   Compiling test v0.1.0 (file:///tmp/test)

Edit: cargo is at version 0.4.0-nightly (15b497b 2015-07-08) (built 2015-07-12)