XCode's syntax highlighting and autocompletion not working

Originator:massil.yataghene
Number:rdar://26586058 Date Originated:01-Jun-2016 11:30 PM
Status:Open Resolved:No
Product:Xcode Product Version:Xcode version 7.3 (7D175)
Classification:Crash Reproducible:Always
 
Summary:
XCode's syntax highlighting and autocompletion stop working systematically when opening files in the https://github.com/artsy/eidolon project and occasionally when working on other project.

Steps to Reproduce:
1. Clone https://github.com/artsy/eidolon/
2. Open Kiosk.xcworkspace
3. Open any source file
4. See the syntax highlighting flicker on and off
5. Try to use autocompletion... 

Expected Results:
I expect syntax highlighting and code completion (the most basic functions of any IDE) to work.

Actual Results:
Syntax highlighting flickers on and off.
Code completion doesn't work.
XCode tells me that "An internal error occured." and that "Source editing functionality is limited".

Version:
Xcode version 7.3 (7D175)
OS X 10.11.5 (15F34)

Notes:
It's impossible to properly work with this bug constantly popping up each time I open a source file/write some code. Please DO something!

Configuration:
Occurs all the time. Tried on a Macbook Pro and a Hackintosh.

Attachments:

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