Syntax highlighting sometimes breaks when using Expression-bodied members (=> methods)

[eamodio]

Environment data

dotnet --info output:

.NET Command Line Tools (1.0.0-preview1-002702)

Product Information:
 Version:     1.0.0-preview1-002702
 Commit Sha:  6cde21225e

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  10.11
 OS Platform: Darwin
 RID:         osx.10.11-x64

VS Code version:

Version 1.2.0-insider (1.2.0-insider)
7ccb21d7e7256a7d42f3dda8b2d3721b8e59724f

C# Extension version:

1.1.2 (pulled from https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.1.2)

Steps to reproduce

For some reason this doesn't happen for all EBMs but I've been using a lot of them lately and they seem to break the highlighting often.

Also any // comments in between the => and rest always breaks the highlighting.

I also tried this on Windows and the syntax highlighting breaks there as well -- though in some cases slightly differently given the same file.

Please let me know if there is any other information I can provide. I experienced the same issue with the "released" version of the C# extension and tried the preview one to see if it helped any (it didn't)

Expected behavior

Correct syntax highlighting

Actual behavior

Sometimes no highlighting, sometimes stuck highlighting in a certain color