Num superclass of Bits (Was: Proposal: Remove Show and Eq superclasses of Num)

John Meacham john at
Sat Sep 17 02:51:38 CEST 2011

I also really dislike that superclass of bits, there is no need for it.


On Fri, Sep 16, 2011 at 5:12 AM, Henning Thielemann
<lemming at> wrote:
> On Fri, 16 Sep 2011, Herbert Valerio Riedel wrote:
>> Just as a side note: I also dislike that the Data.Bits.Bits type-class
>> has Num as its superclass; If I need something to be an instance of the
>> Bits class for the bit-ops, I don't usually want to be forced to provide
>> multiplication and addition operations as well...
> Me too. For instance when working with flag sets like in [1], addition,
> multiplication, absolute value, number literals make no sense.
> [1]
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