Still crashing in Xcode 11b1 too! Something's being mangled incorrectly. @rjmccall, does this look familiar?

Surprisingly, this wasn't actually about Error self-conformance; it was a much more general bug with function signatures that mention retroactive conditional conformances. #26019

Fixes landed in master and 5.1.

jandamm (JIRA User), Could you verify if the problem is fixed and if so move the JIRA to "Closed"?

Thanks!
Anna

Comment by Jan Dammshäuser (JIRA)

I tried with Xcode 11b5 and still got a crash. See lldb-rpc-server_2019-08-16-231847_jans-mbp.crash.

Or do I have to download a Swift snapshot to test?

@rjmccall, Could you check what is happening here?

Comment by Jan Dammshäuser (JIRA)

Today I got the time to test with the official Xcode 11.1 release and it is still crashing.

Comment by Jan Dammshäuser (JIRA)

Here is a small snippet that also produces the crash and has less noice around it:

extension Array: Error where Element: Error {}
func list<E>(_ errors: E...) -> Result<String, [E]> { .failure(errors) }

@swift-ci create

Works on master (I fixed the crash in appendConcreteProtocolConformance a while ago)

The snippet wasn't enough to produce the crash for me, I had to actually use the list method:

extension Array: Error where Element: Error {}
enum Foo: Error { case bar }
func list<E>(_ errors: E...) -> Result<String, [E]> { .failure(errors) }
print(list([Foo.bar, Foo.bar])) // prints failure([[test.Foo.bar, test.Foo.bar]]) on master

Suyash, should this be resolved, then?

Yes, this should be marked as Resolved!