Remove Exception instance for TLSError, bump to 1.8.0

[andrewthad]

Stop throwing TLSError and IOException to make it the exceptions thrown by this library more predicatable.

Resolves #456

[andrewthad]

Also, I think we should let this sit for a while to see if there is any feedback about how this may negatively affect users.

[kazu-yamamoto]

Looks lovely.
I will release v1.7.1 first then merge this PR into master.

[kazu-yamamoto]

Merged.
But I found a problem.
http-client-tls cannot be build since TLSError is not Exception anymore.
I will revert this part.

[kazu-yamamoto]

Done.

[kazu-yamamoto]

A test case of quic gets failed.
I will take care of this.

[andrewthad]

In the longer term, http-client-tls should stop catching exceptions of type TLSError since they are not thrown anymore. But this could be part of a slower plan that happens over the course of a year.

My fear is that, if the Exception instance for TLSError remains available, someone will accidentally start throwing TLSError again. I guess we could add a comment that says something like: "TLSError has an Exception instance for compatibility reasons, but nothing in this library throws TLSError, and the instance will be removed in the future."

[kazu-yamamoto]

I agree.
I will revert the latest commit and send a PR to http-client-tls.
But it would take time because I'm now trying to understand the whole story.

[kazu-yamamoto]

For quic, it seems to me that the following commit solves the issue:
kazu-yamamoto/quic@edd1ab3

[kazu-yamamoto]

@andrewthad Please give a look at kazu-yamamoto/http-client@73d1a4e.

If this is OK with you, I will send a PR to http-client.

[kazu-yamamoto]

@andrewthad Gentle ping.

[andrewthad]

Sorry, I hadn't noticed the command asking me to look at the http-client commit. Yes, guarding the catching of TLSError like that with MIN_VERSION_tls looks right to me.

[kazu-yamamoto]

@andrewthad New versions of http-client-tls, warp-tls and quic are on Hackage.
I'm going to release tls v1.8.0 tomorrow.

[kazu-yamamoto]

v1.8.0 has been released.