Format document (clang-format) does not work if fallbackStyle="" is defined in settings.json

[illegal-instruction]

Type: Bug

Reproduce the issue with the UI settings.
1 - I modified the C_Cpp.clang_format_fallbackStyle setting using the UI to 'LLVM'.
2 - The modified it to ''

VSCode throws a 'formatting failed error' when settings.json looks like this
{
"C_Cpp.clang_format_fallbackStyle": "",
"files.associations": {
"*.tcc": "cpp"
}
}

However, deleting the line fixes it, and formatting is done without errors (since I have the 'file' value in format style and a valid .clang-format file)
{
"files.associations": {
"*.tcc": "cpp"
}
}

Might this be considered an inconsistent behavior?

[sean-mcmanus]

Thanks for reporting this. It also repros with clang_format_style.

[michelleangela]

Fixed in pre-release 1.16.1 https://github.com/microsoft/vscode-cpptools/releases/tag/v1.16.1.

[michelleangela]

Fix is now available in release version 1.16.2.

[illegal-instruction]

Thank you @sean-mcmanus !