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Haskell's an odd case; experienced Haskell users are likely to be thinking of the comma as less of a "separator" than a "combinator" constructing a tuple, and preceding-combinator-on-newline is an idiomatic style. Which doesn't disprove your point, I'm just saying it's an edge case. This is after all the language community that interprets a semicolon (as used in most languages) as a combinator too.

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