default instance for IsString

Johan Tibell johan.tibell at
Wed Apr 25 18:20:16 CEST 2012

On Wed, Apr 25, 2012 at 8:19 AM, Tyson Whitehead <twhitehead at> wrote:
> Is there a technical reason this couldn't be done?  The Haskell report only
> says doing this is not part of haskell.  It doesn't say why.

I think the problem is incoherence, what if the same Map value got
used with two different instances of Int?

-- Johan

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