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-- no default method, backpack
{-# LANGUAGE AllowAmbiguousTypes #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE TypeApplications #-}
unit common where
module Class where
class Show (T x) => C x where
type T x
def :: T x
--type T x = ()
unit consumer-abs where
dependency common
signature Instance where
import Class
data I = I Int
instance C I where
--type T I = ()
module Downstream where
import Class
import Instance
asdf :: C I => String
asdf = show $ def @I
unit consumer-impl where
dependency common
module Impl where
import Class
data I = I Int
instance C I where
type T I = ()
def = ()
unit tie where
dependency consumer-impl
dependency consumer-abs[Instance=consumer-impl:Impl]
module Tie where
import Downstream
main = print asdf
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