SwiftQuest: a Swift course where every exercise runs on a real compiler (beta testers wanted)

Hi all! SwiftQuest teaches Swift by having you write and run it. Every exercise compiles on Swift 6.4 on our servers (Linux, each run in its own gVisor sandbox), and the result explains what happened. The compiler's own messages are shown word for word, failing tests show the values they saw, and you can replay what the program did. It's fifteen islands and forty quests, from your first let to actors and task groups, in the browser with nothing to install. A few Swift details that might interes...