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lehins/fail-vs-case.hs

Created July 17, 2019 17:52
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fail-vs-case.hs
name <- atomically $ do
readTVar (currentUpdate ctxt) >>= \case
name:names <- readTVar (queuedUpdates ctxt)
writeTVar (queuedUpdates ctxt) names
return name
name <- atomically $ do
readTVar (currentUpdate ctxt) >>= \case
Just _ -> retry
Nothing -> readTVar (queuedUpdates ctxt) >>= \case
[] -> retry
(name:names) -> do
writeTVar (queuedUpdates ctxt) names
return name
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