Here's a @rustlang puzzler: the one on the left doesn't compile, the one on the right gives me an ICE. I would expect both of these to work. Is there any way to keep the array length as an associated constant?
Left: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=a00fba0849817c34876ac47e8053c131 …
Right: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=39e91eb95b9cbaa2751dc475b84e27b8 …pic.twitter.com/3FXBy3xp4s

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