agronholm / anyio / 38097290853

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Fix BlockingPortalProvider poisoning itself after a failed first enter (#1350)

If start_blocking_portal().__enter__() raised, _portal_cm was already stored while _portal was never set, so every later __enter__() call skipped startup and returned the nonexistent _portal attribute, masking the real error with an AttributeError forever.

Only publish _portal_cm and _portal once the portal has actually started, so a failed first entry leaves the provider retryable.

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