[jhc] A possible bug with constraints being perceived as multiparameter type classes

This (empty) instance declaration |instance Num (a,b) =>Num (a,b,Int) where | produces the following error when compiled with jhc 0.8.2: |$ 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? ​