Feature Request: Suggest [nodiscard] as a C++ Keyword

[Aubin Van Olden]

Environment

• OS and Version: W11 23H2 (22631.3447)
• VS Code Version: 1.89
• C/C++ Extension Version: 1.20.5

Bug Summary and Steps to Reproduce

Bug Summary:
C++ attributes (nodiscard, fallthrough, ...) are not proposed for auto-completion and doesn't seem to be recognized as C++ keywords when typing. The extension tries to match some symbols with the same name (that is, the attribute itself in a macro from a system/library header) but not the keyword directly.

Steps to reproduce:

1. Write some function with return value
2. Begin to type nodi in the brackets
3. Notice the auto-completion trying to match symbols with the name nodi, but not the keyword nodiscard

Expected behavior:
The auto-completion should propose C++ attributes when typing

Configuration and Logs

-------- Diagnostics - 5/14/2024, 1:01:48 PM
Version: 1.20.5
Current Configuration:
{
    "name": "Win32",
    "includePath": [
        "d:/Documents/C++ tests/**"
    ],
    "defines": [
        "_DEBUG",
        "UNICODE",
        "_UNICODE"
    ],
    "windowsSdkVersion": "10.0.19041.0",
    "cppStandard": "c++23",
    "cStandard": "c17",
    "intelliSenseMode": "windows-msvc-x64",
    "compilerPathIsExplicit": true,
    "cStandardIsExplicit": true,
    "cppStandardIsExplicit": true,
    "intelliSenseModeIsExplicit": true,
    "mergeConfigurations": false,
    "compilerPath": "cl.exe",
    "browse": {
        "path": [
            "d:/Documents/C++ tests/**",
            "${workspaceFolder}"
        ],
        "limitSymbolsToIncludedHeaders": true
    }
}
cpptools version (native): 1.20.5.0
Translation Unit Mappings:
[ D:\Documents\C++ tests\main.cpp - source TU]:
    C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.39.33519\include\vcruntime.h
Translation Unit Configurations:
[ D:\Documents\C++ tests\main.cpp ]:
    Process ID: 39540
    Memory Usage: 203 MB
    Compiler Path: C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.39.33519\bin\Hostx64\x64\cl.exe
    Includes:
        C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.39.33519\include
        C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Tools\MSVC\14.39.33519\atlmfc\include
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\um
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\ucrt
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\shared
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\winrt
        C:\Program Files (x86)\Windows Kits\10\Include\10.0.22621.0\cppwinrt
    Defines:
        _DEBUG
        UNICODE
        _UNICODE
    Standard Version: ms_c++latest
    IntelliSense Mode: windows-msvc-x64
Total Memory Usage: 203 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 21241

------- Potential include path issues --------
Some headers exist in multiple locations. If IntelliSense is behaving incorrectly,
try adding one of the alternate paths to the "includePath" in your configuration in
c_cpp_properties.json to override the automatic path discovery for that header.

Using: C:/Program Files (x86)/Windows Kits/10/Include/10.0.22621.0/ucrt/float.h
    Alternative: "D:/Documents/C++ tests/ffmpeg/compat/float"
Using: C:/Program Files (x86)/Windows Kits/10/Include/10.0.22621.0/ucrt/math.h
    Alternative: "D:/Documents/C++ tests/ffmpeg/compat/aix"
    Alternative: "D:/Documents/C++ tests/ffmpeg/compat/djgpp"
Using: C:/Program Files (x86)/Windows Kits/10/Include/10.0.22621.0/ucrt/time.h
    Alternative: "D:/Documents/C++ tests/ffmpeg/libavutil"

Other Extensions

No response

Additional context

No response

[browntarik]

Thank you for your issue! This would actually qualify as a feature request as this functionality is not currently supported in Visual Studio. Please use this GitHub issue to track progress once it has been picked up.