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module T7944 where
import GHC.Exts
-- Force specialisation of "go"
data SPEC = SPEC | SPEC2
{-# ANN type SPEC ForceSpecConstr #-}
-- This is more or less just an ordinary fold
go :: SPEC -> [a] -> IntMap a -> IntMap a
go SPEC [] m = m
go SPEC (_:xs) m
= go SPEC xs
-- This would be the "worker function" of the fold
$ Unary m
-- Both constructors are necessary, despite only one being used
data IntMap a = Nil | Unary (IntMap a)
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