Skimming the proposal, that looks like the equivalent of the "executor" (scheduler) and "task" (sender) implemented in Rust async runtimes. I could have missed

Skimming the proposal, that looks like the equivalent of the "executor" (scheduler) and "task" (sender) implemented in Rust async runtimes. I could have missed it, but I don't see anything in particular to help with managing structured concurrency? Like, the central challenge is cancellation: In structured concurrency, subtasks spawned from a parent task must finish cancelling before the parent task can be cancelled.