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{-# LANGUAGE MultiParamTypeClasses
,FunctionalDependencies
,FlexibleContexts #-}
module T5643 where
import Prelude ()
class FoldableLL a b | a -> b
class FoldableLL full item => ListLike full item | full -> item where
cons :: item -> full -> full
head :: full -> item
tail :: full -> full
init :: full -> full
init l = cons (head l) (init xs)
where xs = tail l
-- Deriveds from the functional dependencies were escaping in the Wanted
-- constraints and emitWantedCts was giving a panic error.
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