[Type checker] Allow unowned/unowned(unsafe) optional lets. #21638
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Unlike weak values of optional type, an unowned or unowned(unsafe) value of optional type will not silently become 'nil' when the referenced instance goes away: rather, the program will trap. Don't reject unowned or unowned(unsafe) optional lets. Fixes rdar://problem/45732251.
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Unlike weak values of optional type, an unowned or unowned(unsafe)
value of optional type will not silently become 'nil' when the
referenced instance goes away: rather, the program will trap. Don't
reject unowned or unowned(unsafe) optional lets.
Fixes rdar://problem/45732251.