Use wrapped BoxFuture type with must_use #1375
Description
Nice catch!
rust-lang/futures-rs#1691 has a proposal on how this could be worked around (by wrapping the actual BoxFuture in a struct and marking it must_use).
I'd be in favour of using such a type in our codebase wherever we return BoxFuture as these bugs can be really nasty to find (not caught by unit tests) and I really like the rust compiler warnings in these cases.