Not all code posted in a question is always up for review.
Questions frequently include context code that isn't intended to be reviewed, and the best way to indicate that the code you're providing isn't meant to be part of the review is by using quote blocks like this:
> func fooBar() -> String {
> return "fooBar"
> }
This doesn't show up quite so great on meta, as the code and quote blocks appear to have the same background. On the main site, it puts a yellow-ish background behind the gray code block. We take this as a sign that the code is provided as context only and not intended to be reviewed.
I'd highly recommend taking this approach, as it puts all of the necessary information all on one page.