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module Spec where
class C a where { foo,bar :: [a] -> [a] }
instance C Int where
foo x = r_bar x
bar xs = reverse xs
r_bar :: C a => [a] -> [a]
r_bar (x:xs) = bar (xs ++ r_bar xs)
r_bar [] = []
-- We should specialise `r_bar` at Int
-- C.f. Note Note [Avoiding loops (non-DFuns)] in GHC.Core.Opt.Specialise
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