This appears to have legitimate errors on travis

Do you know what "visibility has no effect inside functions" means in the context of the 3rd snippet of rust code in this pull request? Nothing looked out of the ordinary, and when I tried compiling the code locally it had no problems.

Either way, the first two code snippets were already ignored, so I ignored the third one as well. If you want to have them all not ignored, let me know and I will make the fix.

By default, rustdoc will wrap all code snippets in fn main() { /* code snippet */ } so any visibility you place on functions will qualify as putting visibility on functions in functions (disallowed).

You can mitigate the effects with a doc block that looks like:

pub fn foo() {
   // example code
}
# fn main() {} // disable rustdoc injection, also don't show this line.

Ah, thanks for that tip. I will keep that in mind for future documentation pull requests.