Syntax highlighting failure on C++ UDL with '

[mpusz]

Issue Type: Bug

If UDL uses ' signs to separate parts of the number like here:
static_assert(3.2_GHz == 3'200'000'000_Hz);
than the code highlighting is lost until the end of the file.

You can find the exact code here:
https://github.com/mpusz/units/blob/master/test/test_units.cpp

VS Code version: Code 1.30.2 (61122f8, 2019-01-07T22:54:13.295Z)
OS version: Windows_NT x64 10.0.17763

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz (8 x 1896)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Memory (System)	15.38GB (5.60GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (9)

Extension	Author (truncated)	Version
gc-excelviewer	Gra	2.1.28
autoconf	mae	0.0.7
python	ms-	2018.12.1
cpptools	ms-	0.21.0
vsliveshare	ms-	0.3.1136
vsliveshare-audio	ms-	0.1.48
vsliveshare-pack	ms-	0.2.5
cmake	twx	0.0.17
cmake-tools	vec	1.1.3

[DrPizza]

This is very debilitating, as a number of my source files are substantially string coloured.

[sean-mcmanus]

The root cause is being tracked at atom/language-c#127 . Can you upvote that? If #68392 is fixed then maybe we could get a fix that way.

[sean-mcmanus]

FYI, the "Better C++ Syntax" extension just added support for this. If you could try out that extensions and let the author know if you find any issues with it that would be great.

[alexr00]

We've switched to a different grammar for C++ and it looks like it fixed this issue! @jeff-hykin thanks for fixing this.