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|Added at||2016-12-30 11:12|
So I was following tutorials about LazySequenceProtocol and LazyCollectionProtocol.
First, I tried sample codes from Apple's API reference and was able to implement
It worked. I was happy. And after that I wanted to extend it further to
Before adding #2 part, I had 2 errors saying
After adding #2, that is
I thought #2 will fulfill all requirements for