@DougGregor, @slavapestov, did we break something here?

I've run Xcode with SOURCEKIT_LOGGING=3 set in the environment, and SourceKitService seems to be crashing in Diff.swift/Sources/NestedExtendedDiff.swift, specifically the following typealias:

public typealias NestedElementEqualityChecker<T: Collection> = (T.Iterator.Element.Iterator.Element, T.Iterator.Element.Iterator.Element) -> Bool where T.Iterator.Element: Collection

Is there some way to get more information about what in that code is triggering this abort? It's happening across a range of projects, and I'd happily change my approach to get up and running again.

@swift-ci create

Doesn't seem to crash in beta 2 – @tonyarnold, can you confirm?

Sorry Slava, it's still happening to me on beta 2. The compiler works fine, but indexing never completes. Crashes every time with Diff.

Actually, I tell a lie - the compiler still crashes in beta 2. If I run a newer snapshot, the project will compile, but the indexing doesn't ever complete - SourceKitService just crashes over and over until I close the project or quite Xcode.

Update: I just tried with today's Swift 3.1 snapshot, same result. It compiles without crashing, but SourceKitService crashes with a log just like the two attached above.

Ok, thanks, I've reproduced it now.

Fix merged: #7640

😃 thank you!