this fixes the voodoo interface file error we were getting:

[12 of 14] Compiling Hask.Power ( src/Hask/Power.hs, dist/build/Hask/Power.o )
The interface for ‘hask-0:Hask.Core’
Declaration for $fSemitensor(->)Lift6:
  Iface type variable out of scope:  k
Cannot continue after interface file error
Failed to install hask-0