Crash - Syntax Highlighting: 'invalid pattern in look-behind'

[bryphe]

From discord:

I have the Lua Server from Sumneko installed, after a short while, it tears down Onivim
the crashlog says this: (Failure "invalid pattern in look-behind"):

https://discord.com/channels/417774914645262338/424012160696582144/829645005340540958

sr_Nudge note start to grid function.lua.txt

Repro:

• Install the Lua Server from Sumneko
• Navigate to the 3rd line, move cursor over direction
• Press gh

Expected: Hover should show
Actual: Crashes with "invalid pattern in look-behind"

[bryphe]

More callstack:

[ERROR] [ 6.993s] Oni2.Exception : Exception (Failure "invalid pattern in look-behind"):
Raised at file "stdlib.ml", line 29, characters 17-33
Called from file "src/reason-textmate/RegExp.re", line 41, characters 20-33
Called from file "src/reason-textmate/RegExpFactory.re", line 114, characters 11-29
Called from file "src/reason-textmate/Pattern.re", line 126, characters 23-68
Called from file "src/reason-textmate/Pattern.re", line 186, characters 28-66
Called from file "src/reason-textmate/Grammar.re", line 88, characters 19-60
Called from file "list.ml", line 121, characters 24-34
Called from file "src/reason-textmate/Grammar.re", line 119, characters 19-57
Called from file "list.ml", line 121, characters 24-34
Called from file "src/reason-textmate/Grammar.re", line 150, characters 6-65
Called from file "src/Syntax/GrammarRepository.re", line 33, characters 15-54
Called from file "src/reason-textmate/GrammarRepository.re" (inlined), line 8, characters 40-57
Called from file "src/reason-textmate/Tokenizer.re", line 22, characters 9-60
Called from file "src/Syntax/TextmateTokenizerJob.re", line 129, characters 6-174
Called from file "src/Core/Job.re", line 69, characters 4-33
Called from file "src/Core/Job.re" (inlined), line 73, characters 31-42
Called from file "src/Core/Job.re", line 96, characters 15-31
...

Pattern:

STR: (?<=---\s*)@class

[bryphe]

Temporary workaround - you can copy this patched lua syntax over:

https://github.com/onivim/oni2/blob/master/extensions/lua/syntaxes/lua.tmLanguage.json

and then copy it over the syntax that the semneko.lua extension uses, ie:

cp ~/Downloads/lua.tmLanguage.json ~/.config/oni2/extensions/sumneko.lua-1.20.3/syntaxes/lua.tmLanguage.son