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T12373.hs:10:19: error:
• Couldn't match a lifted type with an unlifted type
When matching types
a0 :: *
MVar# RealWorld a1 :: TYPE 'UnliftedRep
Expected type: (# State# RealWorld, a0 #)
Actual type: (# State# RealWorld, MVar# RealWorld a1 #)
• In the expression: newMVar# rw
In the first argument of ‘IO’, namely ‘(\ rw -> newMVar# rw)’
In the first argument of ‘(>>)’, namely ‘IO (\ rw -> newMVar# rw)’
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