出典 https://users.rust-lang.org/t/attempt-to-use-a-non-constant-value-in-a-constant/32112#:~:text=Sep%20%2719-,Use%20vec!%5BDefault%3A%3Adefault()%3B%20n%5D%20or%20Vec%3A%3Awith_capacity(n)%20and%20push%20to%20it.,-Solution # 配列の要素数…