Remove Enum from Float and Double

Johan Tibell johan.tibell at
Tue Jun 11 17:51:07 CEST 2013

Hi Harry,

On Tue, Jun 11, 2013 at 3:51 AM, harry <voldermort at> wrote:

> There have been several discussions over the years regarding Enum instances
> for Float and Double. The conclusion each time appears to have been that
> there are no instances which are both sane and practical.

Do you have a link to some of those discussions? I have a vague memory of
them but can no longer remember the specifics.

> I would like to propose that these instances be removed from Haskell 2014.
> This may be covered by the various alternative prelude and number class
> proposals, but they are much more ambitious and less likely to make it into
> the standard in the short term.

I don't see much gain. It will break previously working code and the
workaround to the breakage will likely be manually reimplementing
enumFromTo in each instance.

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