basis extensionsgood first issuelow effort
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説明
It would be useful to have Char.contains in part of the basis. One simple implementation is the following:
fun contains s c = List.member c (String.explode s)
However, I would suspect that it would be better to avoid the explode and iterate over the string instead for the definition that ends up being translated. It might be neat to prove a theorem of equivalence between them, though.