Doug Gregor 6efaf7ac0f Introduce -warn-concurrency flag to warn about concurrency issues. ...

To help support incremental adoption of the concurrency model, a number
of concurrency-related diagnostics are enabled only in "new" code that
takes advantage of concurrency features---async, @concurrent functions,
actors, etc. This warning flag opts into additional warnings that better
approximate the eventual concurrency model, and which will become
errors a future Swift version, allowing one to both experiment with
the full concurrency model and also properly prepare for it.

2021-03-05 10:58:54 -08:00

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