[Haskell-cafe] Why were datatype contexts removed instead of "fixing them"?
alex.solla at gmail.com
Sun Apr 28 19:35:47 CEST 2013
On Sun, Apr 28, 2013 at 10:29 AM, gs <voldermort at hotmail.com> wrote:
> Brandon Allbery <allbery.b <at> gmail.com> writes:
> > ... which means that implementers should be free to "fix" data type
> > however they like, as they are now complier extensions which won't
> > with standard Haskell.
> > Except that people do build older programs with newer Haskell compilers,
> and it's bad to "repurpose" a syntax like that because it leads to strange
> "Remembering" data type contexts shouldn't break existing code, unless it's
> semantically broken already. (I'm sure that anyone could come up with a
> theoretical example of code which would break
These statements are contradictory.
> - but would it break any
> real-world code?)
I do not support that criterion. We use theory to ENSURE that no
real-world code will break.
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