> > > Barring issues with changing datatypes / class instances, we can already > express many of the API changes you'd want to make to some library [1]. > Now, no one actually does what this proposal suggests - it's a lot of > work, and it doesn't work in general. However, the fact that Haskell makes > something like this seem reasonable is heartening. > > [1] > http://haskellwiki.gitit.net/The%20Monad.Reader/Issue2/EternalCompatibilityInTheory > > Thanks Michael, that seems to be what I was talking about, only 8 years earlier, better thought through, and somewhat more readable.
So why do you say it doesn't work in general?
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