They are clearly grouping "Tree a", but do they mean that it is optional? | Hacker News

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HelloNurse on Oct 3, 2019 | parent | context | favorite | on: What Is Good About Haskell?

They are clearly grouping "Tree a", but do they mean that it is optional?

the_af on Oct 3, 2019 [–]

Why would you assume it's optional? In which popular programming language do parentheses mean "this is optional"? When you read a formula such as

    (x + 1) / 2

do you assume part of it is optional?

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