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{-# LANGUAGE PatternSynonyms #-}
module Main where
pattern ReqNoProv :: Show a => a -> Maybe a
pattern ReqNoProv{j} = Just j
data A = A deriving Show
p1 = Just True
-- The record updates in 'p6' is desugared to the following, as per #18802:
-- p6 = case p1 of ReqNoProv x -> ReqNoProv A
-- (Details of this desugaring can be found in Note [Record Updates] in Tc.Gen.Expr)
p6 = p1 {j = A}
main = print p6
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