If you're wondering where the content actually is, take a look at the commit, where comments are written alongside the code:<p><a href="https://github.com/brson/annotated-std-rs/commit/e50c2b16455ceff29488bf1f058b6c10906ef990" rel="nofollow">https://github.com/brson/annotated-std-rs/commit/e50c2b16455...</a>
It looks like Rust picks up where GCC left off in terms of compile options. I hope this gets cleaned up in later releases as features either become stable or are dropped. This looks like heavy technical debt from the startup phase.