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1.9 KiB
1.9 KiB
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
Loading changes detected in scratch.u.
I found and typechecked these definitions in scratch.u. If you
do an `add` or `update`, here's how your codebase would
change:
⍟ These new definitions are ok to `add`:
structural ability Exception
(also named builtin.Exception)
Exception.unsafeRun! : '{g, Exception} a -> '{g} a
compose2 : (c ->{𝕖1} d)
-> (a ->{𝕖2} b ->{𝕖3} c)
-> a
-> b
->{𝕖1, 𝕖2, 𝕖3} d
ex : '{IO} ()
printLine : Text ->{IO, Exception} ()
putBytes : Handle
-> Bytes
->{IO, Exception} ()
putText : Handle -> Text ->{IO, Exception} ()
stdOut : Handle
toException : Either Failure a ->{Exception} a
.> run ex
()