On Tue, Apr 21, 2015 at 9:26 AM, Artyom <yom@artyom.me> wrote:
$ Temp/jhc-0.8.2/jhc Temp/jhc1.hs 

jhc Temp/jhc1.hs
jhc 0.8.2 (mydniquipepo-32)
Finding Dependencies...
Using Ho Cache: '/home/yom/.jhc/cache'

Temp/jhc1.hs:1   - Error: Invalid Class. multiparameter classes not yet supported:
(Num,[HsTyTuple [HsTyVar {hsTypeName = a},HsTyVar {hsTypeName = b}]])

Am I misunderstanding something, or is it a legitimate bug?

​

Looks multiparameter to me:

    instance ... => Num (T a b Int) where

with T ~ (,,). Which is what the second line of the error message is telling you, more or less.

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