[Haskell-cafe] Backward compatibility

[Adrian May]

>
>
> 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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