I also had a compiler related description come to me after using Copilot. It allows you to partially generate imperative code declaratively, by writing a commen

I also had a compiler related description come to me after using Copilot. It allows you to partially generate imperative code declaratively, by writing a comment like //now I will get rows X, Y, Z from ContentsProvider then tab tab complete. You can then even tweak the generated code, very useful!