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___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 5.03, for Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package std ... linking ... done.
Prelude> -- !!! check we can detect deadlock
Prelude> :set -package concurrent
Loading package lang ... linking ... done.
Loading package concurrent ... linking ... done.
Prelude> Concurrent.newEmptyMVar >>= Concurrent.takeMVar
Deadlocked.
Prelude> Leaving GHCi.
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