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tcfail165.hs:18:17: error: [GHC-83865]
• Couldn't match type: forall a. Show a => a -> String
with: b0 -> String
Expected: IO (MVar (b0 -> String))
Actual: IO (MVar (forall a. Show a => a -> String))
• In a stmt of a 'do' block:
var <- newEmptyMVar :: IO (MVar (forall a. Show a => a -> String))
In the expression:
do var <- newEmptyMVar ::
IO (MVar (forall a. Show a => a -> String))
putMVar var (show :: forall b. Show b => b -> String)
In an equation for ‘foo’:
foo
= do var <- newEmptyMVar ::
IO (MVar (forall a. Show a => a -> String))
putMVar var (show :: forall b. Show b => b -> String)
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