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{-# LANGUAGE DataKinds, TypeOperators, TypeFamilies,
KindSignatures, ConstraintKinds #-}
module T11249 where
import GHC.TypeLits
type a / b = FDiv a b
type a ** b = FMul a b
type family FDiv a b where
FDiv 11648 128 = 91
type family FMul a b where
FMul 64 91 = 5824
type family FGCD a b where
FGCD 128 448 = 64
FGCD 128 5824 = 64
type family FLCM a b where
FLCM 128 5824 = 11648
data CT (m :: Nat) (m' :: Nat)
type H0 = 128
type H1 = 448
type H0' = 11648
type H1' = 5824
main' = let x = undefined :: CT H0 H0'
in foo x :: CT H1 H1'
foo x = bug x
type Ctx2 e r s e' r' =
(e ~ FGCD r e', r' ~ FLCM r e', e ~ FGCD r s)
bug :: (Ctx2 e r s e' r', e' ~ (e ** (FDiv r' r)))
=> CT r r' -> CT s s'
bug = undefined
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