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{-# LANGUAGE TypeFamilies #-}
module Simple15 where
(<$) :: p -> (p -> q) -> q
x <$ f = f x
type family Def p
def :: Def p -> p
def = undefined
data EQU a b = EQU
equ_refl :: EQU a a
equ_refl = EQU
data FOO = FOO
type instance Def FOO = EQU () ()
foo :: FOO
foo = equ_refl <$ def
-- This works:
-- foo = def $ equ_refl
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