Use of bash bitwise shift left causes colour highlighting to break

[theknowledge]

Type: Bug

Including bash bitwise shift left << inside a variable assignment causes all subsequent colour highlighting to break, all text except $variables appears orange
e.g.
b=$(( a << 4 ))

Other operators do not cause a problem.

VS Code version: Code 1.90.2 (5437499, 2024-06-18T22:34:26.404Z)
OS version: Windows_NT x64 10.0.19045
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (8 x 3600)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled
Load (avg)	undefined
Memory (System)	15.85GB (5.25GB free)
Process Argv	--crash-reporter-id bec0f67a-4990-41d2-bfd2-893d445a558a
Screen Reader	no
VM	0%

Extensions (23)

Extension	Author (truncated)	Version
doxdocgen	csc	1.4.0
better-cpp-syntax	jef	1.27.1
rainbow-csv	mec	3.12.0
debugpy	ms-	2024.8.0
python	ms-	2024.12.3
vscode-pylance	ms-	2024.8.2
jupyter	ms-	2024.5.0
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.0.19
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
remote-containers	ms-	0.380.0
remote-ssh	ms-	0.113.1
remote-ssh-edit	ms-	0.86.0
remote-wsl	ms-	0.88.2
cmake-tools	ms-	1.19.49
cpptools	ms-	1.21.6
cpptools-extension-pack	ms-	1.3.0
makefile-tools	ms-	0.10.26
remote-explorer	ms-	0.4.3
tcl	ras	0.1.0
shellcheck	tim	0.37.1
cmake	twx	0.0.17

(1 theme extensions excluded)

A/B Experiments

vsliv368:30146709
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
vsaa593cf:30376535
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
pythongtdpath:30769146
welcomedialogc:30910334
pythonnoceb:30805159
asynctok:30898717
pythonregdiag2:30936856
pythonmypyd1:30879173
h48ei257:31000450
pythontbext0:30879054
accentitlementsc:30995553
dsvsc016:30899300
dsvsc017:30899301
dsvsc018:30899302
cppperfnew:31000557
dsvsc020:30976470
pythonait:31006305
dsvsc021:30996838
bdiig495:31013172
pythoncenvpt:31062603
a69g1124:31058053
dvdeprecation:31068756
dwnewjupytercf:31046870
impr_priority:31102340
refactort:31108082
pythonrstrctxt:31112756
wkspc-onlycs-c:31111717
wkspc-ranged-t:31125599
ei213698:31121563
aajjf12562:31125793

[vs-code-engineering]

Thanks for creating this issue! It looks like you may be using an old version of VS Code, the latest stable release is 1.92.2. Please try upgrading to the latest version and checking whether this issue remains.

Happy Coding!

[theknowledge]

Problem persists in v1.92.2

[alexr00]

Can you share a screenshot?

[theknowledge]

Hi Alex, sure thing:

As opposed to:

Thanks

[johan-boule]

I think VSCode's syntax parsing for Bash or just posix shell, is probably only 50% correct, no more.
I don't use VSCode for doing bash stuff, because the colors are wrong half the time and it's distracting.

[alexr00]

Duplicate of the upstream issue jeff-hykin/better-shell-syntax#93, but because of the license change we can't take the fix.