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0031542faf
This is for consistency with the `cmark` style. Now the blocks we still pretty-print ourselves will match the bulk of them that `cmark` produces.
95 lines
2.5 KiB
Markdown
95 lines
2.5 KiB
Markdown
``` unison
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structural ability Exception where raise : Failure -> x
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reraise = cases
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Left e -> raise e
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Right a -> a
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structural type Either a b = Left a | Right b
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putBytes h bs = reraise (putBytes.impl h bs)
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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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bugFail = cases
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Failure typ _ _ -> bug (Failure typ "problem" (Any ()))
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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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bugFail fail
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{a} -> a
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handle !e with h
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socketSend s bytes = reraise (socketSend.impl s bytes)
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closeSocket s = reraise (closeSocket.impl s)
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serverSocket host port = reraise (IO.serverSocket.impl host port)
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hello : Text -> Text -> {IO, Exception} ()
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hello host port =
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socket = serverSocket (Some host) port
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msg = toUtf8 "Hello there"
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socketSend socket msg
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closeSocket socket
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myServer = unsafeRun! '(hello "127.0.0.1" "0")
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```
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``` ucm
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Loading changes detected in scratch.u.
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I found and typechecked these definitions in scratch.u. If you
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do an `add` or `update`, here's how your codebase would
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change:
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⍟ These new definitions are ok to `add`:
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structural type Either a b
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(also named builtin.Either)
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structural ability Exception
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(also named builtin.Exception)
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Exception.unsafeRun! : '{g, Exception} a -> '{g} a
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bugFail : Failure -> r
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closeSocket : Socket ->{IO, Exception} ()
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hello : Text -> Text ->{IO, Exception} ()
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myServer : '{IO} ()
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putBytes : Handle
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-> Bytes
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->{IO, Exception} ()
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putText : Handle -> Text ->{IO, Exception} ()
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reraise : Either Failure b ->{Exception} b
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serverSocket : Optional Text
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-> Text
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->{IO, Exception} Socket
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socketSend : Socket
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-> Bytes
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->{IO, Exception} ()
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toException : Either Failure a ->{Exception} a
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```
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``` ucm
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scratch/main> run myServer
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💔💥
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I've encountered a call to builtin.bug with the following
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value:
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Failure (typeLink IOFailure) "problem" (Any ())
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Stack trace:
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bug
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#8ppr1tt4q2
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```
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