John McCall 2012195cd5 Alter the runtime interface for awaiting futures and task groups. ...

First, just call an async -> T function instead of forcing the caller
to piece together which case we're in and perform its own copy.  This
ensures that the task is actually kept alive properly.

Second, now that we no longer implicitly depend on the waiting tasks
being run synchronously, go ahead and schedule them to run on the
global executor.

This solves some problems which were blocking the work on TLS-ifying
the task/executor state.

2021-02-21 23:48:13 -05:00

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