Fail to build with rustc 1.20.0-nightly (2fbba5bdb 2017-07-04)

[oxalica]

Here's the detail log.
Seems caused by rust-lang/rust#43012.

[oli-obk]

Just needs a rerun of cargo test + committing the changes

[oxalica]

@oli-obk Maybe I can do it. But I think codes using removed features in tests should be removed first, so that they will do the real "test".