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Dmitri Gribenko committed a385779e41f
stdlib: define a custom mirror for DictionaryGenerator and SetGenerator The default mirror tries to access implementation details of the generator, accessing the 'description' property of the storage, which is an NSDictionary subclass. The default implementation of -[NSDictionary description] tries to print the dictionary contents. But if the Swift.Dictionary can't be bridged to NSDictionary, that causes a runtime trap. rdar://problem/24238609