[swift-users] How to debug Xcode: "An internal error occurred. Source editor functionality is limited"

Jesse Grosjean jesse at hogbaysoftware.com
Sat Apr 8 15:19:42 CDT 2017

Ok, I've got a pretty short test case that I've posted here:


It doesn't crash the compiler, but it consistently crashes SourceKitService
when you try to add a function to the extension.


On Fri, Apr 7, 2017 at 11:58 PM Brent Royal-Gordon <brent at architechies.com>

> On Apr 7, 2017, at 11:21 AM, Jesse Grosjean via swift-users <
> swift-users at swift.org> wrote:
> Does anyone recognize the below stack and know what might be causing that
> particular crash? Is there any way to log what file the SourceKitService is
> working on, so I can see what it's doing before the crash?
> After manually going through all my code and individually adding files
> back to the project I've found (fingers crossed!) a fix. I don't understand
> all the conditions neccessary, but the problem is related to defining class
> extensions in files separate from where the class is originally defined.
> So I didn't change any code to fix the problem, but I did move a number of
> class extensions out of separate files and just append the extensions text
> to the end of the original file where the class was defined.
> Hope this helps someone to avoid all the fun I just went through!
> If you can reduce this down to a small test case, and especially if you
> get the same crash when you try to compile your code, it'd be very helpful
> if you could file a bug at bugs.swift.org. The compiler's repository has
> a big folder full of examples that crash it, and we do get around to fixing
> them!
> --
> Brent Royal-Gordon
> Architechies
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