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{-# OPTIONS_GHC -fwarn-redundant-constraints #-}
module T9973 where
duplicateDecl :: (Eq t) => t -> IO ()
-- #9973 was a bogus "redundant constraint" here
duplicateDecl sigs
= do { newSpan <- return typeSig
-- **** commenting out the next three lines causes the original warning to disappear
; let rowOffset = case typeSig of { _ -> 1 }
; undefined }
where
typeSig = definingSigsNames sigs
definingSigsNames :: (Eq t) => t -> ()
definingSigsNames x = undefined
where
_ = x == x -- Suppress the complaint on this
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