2021-05-27 20:39:09 +03:00
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```ucm:hide
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2024-06-12 01:22:09 +03:00
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scratch/main> builtins.mergeio
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2021-05-27 20:39:09 +03:00
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```
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```unison
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2021-08-24 21:33:27 +03:00
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structural ability Exception where raise : Failure -> x
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2021-05-27 20:39:09 +03:00
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ex = unsafeRun! '(printLine "hello world")
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printLine : Text ->{IO, Exception} ()
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printLine t =
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putText stdOut t
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putText stdOut "\n"
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stdOut : Handle
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stdOut = stdHandle StdOut
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2021-06-08 21:50:04 +03:00
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compose2 : (c ->{𝕖1} d) -> (a ->{𝕖2} b ->{𝕖3} c) -> a -> b ->{𝕖1,𝕖2,𝕖3} d
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2021-05-27 20:39:09 +03:00
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compose2 f g x y = f (g x y)
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putBytes : Handle -> Bytes ->{IO, Exception} ()
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putBytes = compose2 toException putBytes.impl
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toException : Either Failure a ->{Exception} a
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toException = cases
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Left e -> raise e
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Right a -> a
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putText : Handle -> Text ->{IO, Exception} ()
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putText h t = putBytes h (toUtf8 t)
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Exception.unsafeRun! : '{Exception, g} a -> '{g} a
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Exception.unsafeRun! e _ =
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h : Request {Exception} a -> a
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h = cases
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{Exception.raise fail -> _ } ->
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bug fail
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{a} -> a
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handle !e with h
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```
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```ucm
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2024-06-12 01:22:09 +03:00
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scratch/main> run ex
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2021-05-27 20:39:09 +03:00
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```
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