unison/unison-src/transcripts/patternMatchTls.md
2024-06-25 11:11:07 -07:00

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Markdown

```ucm:hide
scratch/main> builtins.merge
```
We had bugs in the calling conventions for both send and terminate which would
cause pattern matching on the resulting (Right ()) would cause a runtime error.
```unison
use builtin.io2.Tls newClient send handshake terminate
frank: '{IO} ()
frank = do
socket = assertRight (clientSocket.impl "example.com" "443")
config = ClientConfig.default "example.com" 0xs
tls = assertRight (newClient.impl config socket)
() = assertRight (handshake.impl tls)
() = assertRight (send.impl tls 0xs)
() = assertRight (terminate.impl tls)
()
assertRight : Either a b -> b
assertRight = cases
Right x -> x
Left _ -> bug "expected a right but got a left"
```
```ucm
scratch/main> add
scratch/main> run frank
```