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A comment on What Is Good About Haskell?. Parent comment

Re:What Is Good About Haskell? by HelloNurse on Thursday October 03, 2019 @11:24AM (#21148071)
They are clearly grouping "Tree a", but do they mean that it is optional?
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Re:What Is Good About Haskell? by the_af on Thursday October 03, 2019 @11:57AM (#21148459)
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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