[Haskell-cafe] Backward compatibility

[Ertugrul Söylemez]

Adrian May <adrian.alexander.may at gmail.com> wrote:

> > Changes already made in the base library or in one of the platform
> > libraries:
>
> So could you pick the most unassailable and tell me more about it
> please?

I'll just pick a random example:  Eq and Show are no longer superclasses
of Num.  I'm the author of the Netwire library, a library for functional
reactive programming.  Before that change you would write the following
code to express a clock that runs twice as fast as the real time clock
and oscillates up and down while gradually increasing:

    liftA2 (\t o -> 2*t + sin o) time (integral_ 0 . v)

Thanks to the change you can now write it as:

    2*time + sin (integral_ 0 . v)


Greets,
Ertugrul

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