> by making async lifetimes correspond to ordinary C++ lexical scopes ... That's the easy part and typically not entirely what you want. Suppose you have some

> by making async lifetimes correspond to ordinary C++ lexical scopes ... That's the easy part and typically not entirely what you want. Suppose you have some fibers you launched via a parmap. Most of these will end more or less at the same time, but some will be laggards and these need to be tracked in some way. That tracking typically happens outside of your current lexical scope as they might not influence the success of the composed fiber.