[steveklabnik]

It's hard to remember specifics, as this is usually based off of someone jumping into IRC and asking a question about how a certain thing works. They're often very detailed things that require intimate knowledge of implementation details. Or threads like http://www.reddit.com/r/rust/comments/31mgav/what_would_the_... , which isn't really _wrong_, but unions are hard, and so people miss them.

This kind of thing happens any time you transition languages: when I started hacking on Rust, I was trying to figure out how to do the metaprogramming shenanigans that Ruby lets me do. Ironically, Rust's metaprogramming features are my biggest weakness as a Rust programmer, I don't really write my own macros.