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{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE KindSignatures #-}
module Lib where
import Data.Type.Equality
import GHC.TypeLits
import GHC.TypeNats
data A (t :: Nat) = A
data B (t :: Nat) = B
data C (t :: Symbol) = C
data D (t :: Symbol) = D
cmpNats :: (KnownNat n, KnownNat m) => A n -> B m -> Bool
cmpNats a b = case a `sameNat` b of
Nothing -> False
Just Refl -> True
cmpSymbols :: (KnownSymbol n, KnownSymbol m) => C n -> D m -> Bool
cmpSymbols c d = case c `sameSymbol` d of
Nothing -> False
Just Refl -> True
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