Alastair Houghton b3cbdf84ed [Concurrency] Fix null pointer dereference for task-to-thread model. ...

In task-to-thread concurrency mode, `_getMainExecutorAsSerialExecutor`
returns `SerialExecutorRef::generic()`, which is, give or take, NULL.
Unfortunately we'd declared it as returning `any SerialExecutor`,
rather than `(any SerialExecutor)?`, and then the `getMainExecutor()`
function was calling `asUnownedSerialExecutor()` on it, which then
crashes.

rdar://153152063

2025-06-12 11:53:35 +01:00

4.6 KiB

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