It's just a thing we have to do sometimes, so the compiler stops being mad at us, and things just suddenly start working. That's not necessarily a bad thing. That's just how good compiler diagnostics are, that it can just tell you "hold on there friend, I really think you want to box it", and you can copy and paste the solution, and the puzzle is cracked.

URL:
https://fasterthanli.me/articles/whats-in-the-box
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