also, totally unreleated, can I offer a challenge ...

# coroutines

[groostav]

also, totally unreleated, can I offer a challenge to those with coroutine chops: convert guice's SingletonScope implementation to use suspension instead of locks (or better yet, make the locking scheme parametric). https://github.com/google/guice/blob/master/core/src/com/google/inject/internal/SingletonScope.java

note the description for the faint of heart:

Introduction from the author: Implementation of this class seems unreasonably complicated at the first sight. I fully agree with you, that the beast below is very complex and it's hard to reason on how does it work or not. Still I want to assure you that hundreds(?) of hours were thrown into making this code simple, while still maintaining Singleton contract.

I'd like to have a crack at it.