While testing #5220, I noticed that if I specify "cppStandard": "c++98" in c_cpp_properties.json, I do not get red squiggles for code below, but if I specify "cppStandard": "c++03", then I do. That is without CMake Tools extension.

I also do get red squiggles when I use CMake Tools extension as configuration provider "configurationProvider": "ms-vscode.cmake-tools" and having target_compile_features(test PRIVATE cxx_std_98) in CMakeLists.txt.

The error is error: '>>' should be '> >' within a nested template argument list.

#include <vector>

int main()
{
    std::vector<std::vector<int>> v;
    return 0;
}