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なぜジェネリクスにしないと引数にできないのか?[Protocol 'b' can only be used as a generic constraint because it has Self or associated type requirements] - Qiita
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How to fix the error “protocol can only be used as a generic constraint because it has Self or associated type requirements” - free Swift 5.1 example code and tips
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Why Associated Type Requirements Become Generic Constraints - Digital product development agency | Big Nerd Ranch
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Dependencies with associated type protocol constraints generate invalid code · Issue #40 · scribd/Weaver · GitHub
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