Created
May 13, 2019 03:55
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| new :: forall a r. a -> ST r (STRef r a) | |
| read :: forall a r. STRef r a -> ST r a | |
| write :: forall a r. a -> STRef r a -> ST r a | |
| myDoExpr :: forall r. ST r Int | |
| myDoExpr = do | |
| -- ref :: STRef r Int | |
| ref <- Ref.new 0 | |
| -- val :: Int | |
| val <- Ref.read ref | |
| -- ST r Int | |
| Ref.write (val + 1) ref |
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