Weird, all the tests passed. Doesn't seem like it ran:
~~~
run doc-crate-collections [x86_64-apple-darwin]

running 2 tests
test hashmap::HashMap_0 ... ok
test lru_cache_0 ... ok
~~~

Maybe I should remove `rust` in `~~~rust`?

Also, how *would* I do this test? I thought you couldn't do `#[phase(syntax)] extern crate collections;` from within a doc test?