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974 B
974 B
scratch/main> builtins.mergeio
structural ability Exception where raise : Failure -> x
ex = unsafeRun! '(printLine "hello world")
printLine : Text ->{IO, Exception} ()
printLine t =
putText stdOut t
putText stdOut "\n"
stdOut : Handle
stdOut = stdHandle StdOut
compose2 : (c ->{𝕖1} d) -> (a ->{𝕖2} b ->{𝕖3} c) -> a -> b ->{𝕖1,𝕖2,𝕖3} d
compose2 f g x y = f (g x y)
putBytes : Handle -> Bytes ->{IO, Exception} ()
putBytes = compose2 toException putBytes.impl
toException : Either Failure a ->{Exception} a
toException = cases
Left e -> raise e
Right a -> a
putText : Handle -> Text ->{IO, Exception} ()
putText h t = putBytes h (toUtf8 t)
Exception.unsafeRun! : '{Exception, g} a -> '{g} a
Exception.unsafeRun! e _ =
h : Request {Exception} a -> a
h = cases
{Exception.raise fail -> _ } ->
bug fail
{a} -> a
handle !e with h
scratch/main> run ex