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{-# LANGUAGE DataKinds, TypeOperators, ConstraintKinds, TypeFamilies, NoMonoLocalBinds, NoMonomorphismRestriction #-}
{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}
module T10134 where
import GHC.TypeLits
import T10134a
import Prelude
type Positive n = ((n-1)+1)~n
data Dummy n d = Dummy { vec :: Vec n (Vec d Bool) }
nextDummy :: Positive (2*(n+d)) => Dummy n d -> Dummy n d
nextDummy d = Dummy { vec = vec dFst }
where (dFst,dSnd) = nextDummy' d
nextDummy' :: Positive (2*(n+d)) => Dummy n d -> ( Dummy n d, Bool )
nextDummy' _ = undefined
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