I wrote a comment a while ago that has some code examples: https://github.com/rust-lang/rfcs/pull/243#issuecomment-82201255 https://github.com/rust-lang/rfcs/pu

I wrote a comment a while ago that has some code examples: https://github.com/rust-lang/rfcs/pull/243#issuecomment-82201255 https://github.com/rust-lang/rfcs/pull/243#issuecomment-8220... (and the following two comments)