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{-# LANGUAGE OverloadedStrings, LambdaCase #-}
module T15713 where
import Data.String
data Expr = App Expr Expr | Var String
deriving (Eq)
instance IsString Expr where
fromString = Var . fromString
go = \case
App ( App ( App "refWithFile" identM ) filenameM) exceptionMayM -> Just 2
App ( App "and" a ) b -> Just 3
App ( App "or" a ) b -> Just 4
_ -> Nothing
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