英國超市將巧克力鎖進防盜盒阻止「訂單式」偷竊
Glasögon video A.mp4
，更多细节参见Safew下载
One challenging part of this phase of development was the need to continue adding new features to the game while simultaneously converting the game's architecture for offline play.
→ compiler₂: + let, letrec, ADTs
So it could add to the standard library without overriding the standard library.