nightly CI is broken

[jdm]

+cd rcdom

+cargo test --features rustc-test/capture

error[E0425]: cannot find function `set_print` in module `io`

    --> /home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-test-0.3.0/src/lib.rs:1149:21

     |

1149 |                 io::set_print(Some(Box::new(Sink(data2.clone()))));

     |                     ^^^^^^^^^ help: a function with a similar name exists: `_eprint`

error[E0425]: cannot find function `set_panic` in module `io`

    --> /home/travis/.cargo/registry/src/github.com-1ecc6299db9ec823/rustc-test-0.3.0/src/lib.rs:1150:21

     |

1150 |                 io::set_panic(Some(Box::new(Sink(data2))));

     |                     ^^^^^^^^^ not found in `io`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0425`.

error: could not compile `rustc-test`

[jdm]

https://github.com/servo/rustc-test/blob/4cf9a4541f66a763badec6dbf0ca09eba257f1ba/src/lib.rs#L1149-L1150 needs to be updated to account for rust-lang/rust@aff7bd6#diff-c97db2b21b8a2577efe055c1ece23c3b2de03f4767157cf894b08afd536f06b7.

[rillian]

Looks like this can be closed. CI seems to be passing. And, if nothing else, the rustc-test/capture feature is obsoleted by #528.