Highlight `dyn` as a keyword

[vi]

dyn is already implemented in nightly, so maybe dyn should be highlighted somehow in the playpen?

[shepmaster]

should be highlighted somehow

Syntax highlighting is provided by Ace — perhaps you'd be willing to submit a pull request to them?

in the playpen?

There is no playpen. There is only the playground.

[vi]

"Rust Playpen" =? "The Rust Playground" =? "play.rust-lang.org site".

[shepmaster]

Sounds good, vim [sic]. Names have meanings and differences; the very old site was called the playpen.

[vi]

Only now realized that there is a difference while trying to find a proof that they're the same.

[shepmaster]

Thank you for opening an issue on Ace. Once there's a corresponding PR, I can probably hack up the existing Rust highlighter using the diff. I just don't want to be forced into maintaining a perpetual fork of an open source project without very good reason.

[vi]

The PR has been merged.