C# syntax highlighting of interpolated strings

[dmcbride]

Issue Type: Bug

I create a new C# file and put the following code into it:

namespace foo;
public class Foo
{
    public record Z(string s);
    public static string[] x = new [] {
        $"foo {{0}} bar{w}",
    };
}

I expect the interpolated string to show everything except the w in a single colour, the string colour. However, with the record, which isn't even being used anywhere else, the syntax highlighting is all over the map. If I comment out the record, then the string appears exactly as expected.

Expected:

Actual:

VS Code version: Code 1.64.2 (f80445a, 2022-02-09T22:02:29.527Z)
OS version: Linux x64 5.14.16-gentoo
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz (12 x 3700)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: disabled_off opengl: enabled_on rasterization: disabled_software skia_renderer: enabled_on video_decode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	4, 5, 5
Memory (System)	31.30GB (0.41GB free)
Process Argv	. --crash-reporter-id a35db7b1-57ea-4dd9-a3f7-4ffe723758c1
Screen Reader	no
VM	0%
DESKTOP_SESSION	/usr/share/xsessions/plasma
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE
XDG_SESSION_TYPE	x11

Extensions: none

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30256859
pythonvspyl392:30443607
pythontb:30283811
pythonvspyt551cf:30345471
pythonptprofiler:30281270
vshan820:30294714
vstes263cf:30335440
pythondataviewer:30285071
vscod805:30301674
pythonvspyt200:30340761
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593cf:30376535
vsc1dst:30438360
pythonvs932:30410667
wslgetstarted:30433507
vsclayoutctrc:30437038
vsrem710:30416614
vscop841cf:30438916
dsvsc009:30440023
pythonvsnew555:30442236
vsbas813:30436447
vscscmwlcmc:30438804
helix:30440343
vsnot107:30443614

[alexr00]

Duplicate of the upstream issue dotnet/csharp-tmLanguage#202