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Haskell language extensions do not change the language semantics. They extend the semantics with additional functionality. Existing code does not change its m
by tome 7y ago
Haskell language extensions do not change the language semantics. They extend the semantics with additional functionality. Existing code does not change its meaning when you enable an extension.
- patrec 7y agoStrict. Not a change in language semantics at all.
- tome 7y agoAh, great counterexample! StrictData is another. Do you know any others that change language semantics non-trivially? I would roughly define "non-trivially" to mean "correct programs become incorrect". By the way, I'm particularly interested because I am writing about Haskell myths. I have a very rough draft at http://h2.jaguarpaw.co.uk/posts/haskell-myths/ http://h2.jaguarpaw.co.uk/posts/haskell-myths/
- cannabis_sam 7y agoThere’s also QuasiQuoter which can make valid code with list comprehensions not compile, but it doesn’t just compile it, it gets stuck looking for the end tag. Not sure if that qualifies :P