invalid type conversion IntelliSense

[raigorx]

Environment

Windows 11
10.0.22621 Build 22621

• VS Code Version: 1.80.2
• C/C++ Extension Version: v1.16.3

Bug Summary and Steps to Reproduce

Open a .cpp file in vscode with this code

void normal_function(int number, char character) {}

int main() {
 (void*&)normal_function;

 &(void*&)normal_function;

 return 0;
}

IntelliSense is reporting the following error, however the code compiles fine in MSVC

[{
	"resource": "/C:/Test/bug_report/main.cpp",
	"owner": "C/C++: IntelliSense",
	"code": "171",
	"severity": 8,
	"message": "invalid type conversion",
	"source": "C/C++",
	"startLineNumber": 4,
	"startColumn": 4,
	"endLineNumber": 4,
	"endColumn": 8
}]

In fact the same error is seeing in visual studio 2022 but again the code compiles without any problem

Configuration and Logs

Logs:

loggingLevel: Debug
cpptools version (TypeScript): 1.16.3
cpptools version (native): 1.16.3.0
Autocomplete is enabled.
Error squiggles are enabled if all header dependencies are resolved.
Hover is enabled.
IntelliSense Engine = default.
LSP: cpptools/queryCompilerDefaults (id: 1)
LSP: cpptools/didChangeCppProperties (id: 2)
LSP: cpptools/textEditorSelectionChange
Code browsing service initialized
 Folder: C:/PROGRAM FILES (X86)/MICROSOFT VISUAL STUDIO/2019/BUILDTOOLS/VC/TOOLS/MSVC/14.29.30133/INCLUDE/* will be indexed
 Folder: C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/CPPWINRT/ will be indexed
 Folder: C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/SHARED/ will be indexed
 Folder: C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/UCRT/ will be indexed
 Folder: C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/UM/ will be indexed
 Folder: C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/WINRT/ will be indexed
 Folder: C:/TEST/BUG_REPORT/ will be indexed
 Folder: C:/UTILS/VCPKG/INSTALLED/X64-WINDOWS/INCLUDE/ will be indexed
 Folder: C:/UTILS/VCPKG/INSTALLED/X86-WINDOWS/INCLUDE/ will be indexed
Discovering files...
 Processing folder (non-recursive): C:/PROGRAM FILES (X86)/MICROSOFT VISUAL STUDIO/2019/BUILDTOOLS/VC/TOOLS/MSVC/14.29.30133/INCLUDE
 Processing folder (recursive): C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/CPPWINRT/
LSP: textDocument/didOpen: file:///c%3A/Test/bug_report/main.cpp
 Processing folder (recursive): C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/SHARED/
LSP: cpptools/activeDocumentChange: file:///c%3A/Test/bug_report/main.cpp
 Processing folder (recursive): C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/UCRT/
LSP: cpptools/getInlayHints: file:///c%3A/Test/bug_report/main.cpp (id: 3)
 Processing folder (recursive): C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/UM/
LSP: cpptools/getDocumentSymbols: file:///c%3A/Test/bug_report/main.cpp (id: 4)
LSP: cpptools/getFoldingRanges: file:///c%3A/Test/bug_report/main.cpp (id: 5)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/activeDocumentChange: file:///c%3A/Test/bug_report/main.cpp
c:\Users\raigo\.vscode\extensions\ms-vscode.cpptools-1.16.3-win32-x64/bin/../LLVM/bin/clang-tidy.exe
--header-filter=(C:/Test/bug_report|C:\\Test\\bug_report)
--export-fixes=C:\Users\raigo\AppData\Local\Temp\{8696044937690906415}\fixes31664.yaml
--quiet
--use-color=false
C:/Test/bug_report/main.cpp
-p=C:/Test/bug_report
 Processing folder (recursive): C:/PROGRAM FILES (X86)/WINDOWS KITS/10/INCLUDE/10.0.22621.0/WINRT/
 Processing folder (recursive): C:/TEST/BUG_REPORT/
 Processing folder (recursive): C:/UTILS/VCPKG/INSTALLED/X64-WINDOWS/INCLUDE/
 Processing folder (recursive): C:/UTILS/VCPKG/INSTALLED/X86-WINDOWS/INCLUDE/
 Discovering files: 5127 file(s) processed
 0 file(s) removed from database
Done discovering files.
Populating include completion cache.
Parsing remaining files...
 Parsing: 0 files(s) processed
Done parsing remaining files.
sending compilation args for C:\Test\bug_report\main.cpp
 include: C:\UTILS\VCPKG\INSTALLED\X64-WINDOWS\INCLUDE
 include: C:\UTILS\VCPKG\INSTALLED\X86-WINDOWS\INCLUDE
 include: C:\PROGRAM FILES (X86)\MICROSOFT VISUAL STUDIO\2019\BUILDTOOLS\VC\TOOLS\MSVC\14.29.30133\INCLUDE
 include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.22621.0\UM
 include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.22621.0\UCRT
 include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.22621.0\SHARED
 include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.22621.0\WINRT
 include: C:\PROGRAM FILES (X86)\WINDOWS KITS\10\INCLUDE\10.0.22621.0\CPPWINRT
 define: _DEBUG
 define: UNICODE
 define: _UNICODE
 stdver: ms_c++20
 intelliSenseMode: windows-msvc-x64
Checking for syntax errors: C:\Test\bug_report\main.cpp
Queueing IntelliSense update for files in translation unit of: C:\Test\bug_report\main.cpp
LSP: cpptools/getSemanticTokens: file:///c%3A/Test/bug_report/main.cpp (id: 6)
Error while trying to load a compilation database:
Could not auto-detect compilation database from directory "C:/Test/bug_report"
No compilation database found in C:\Test\bug_report or any parent directory
fixed-compilation-database: Error while opening fixed database: no such file or directory
json-compilation-database: Error while opening JSON database: no such file or directory
Running without flags.
C:\Test\bug_report\main.cpp:4:3: warning: expression result unused [clang-diagnostic-unused-value]
 (void*&)normal_function;
 ^ ~~~~~~~~~~~~~~~
C:\Test\bug_report\main.cpp:6:3: warning: expression result unused [clang-diagnostic-unused-value]
 &(void*&)normal_function;
 ^~~~~~~~~~~~~~~~~~~~~~~~
Error squiggle count: 2
Update IntelliSense time (sec): 0.456
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/getFoldingRanges: file:///c%3A/Test/bug_report/main.cpp (id: 7)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 8)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 9)
LSP: cpptools/getDocumentSymbols: file:///c%3A/Test/bug_report/main.cpp (id: 10)
LSP: cpptools/getFoldingRanges: file:///c%3A/Test/bug_report/main.cpp (id: 11)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 12)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 13)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 14)
LSP: cpptools/getDocumentSymbols: file:///c%3A/Test/bug_report/main.cpp (id: 15)
LSP: cpptools/getFoldingRanges: file:///c%3A/Test/bug_report/main.cpp (id: 16)
Unable to find cl.exe. C/C++: cl.exe build active file task is ignored.
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 17)
LSP: cpptools/getDocumentSymbols: file:///c%3A/Test/bug_report/main.cpp (id: 18)
LSP: cpptools/getFoldingRanges: file:///c%3A/Test/bug_report/main.cpp (id: 19)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 20)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 21)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 22)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 23)
LSP: cpptools/getCodeActions: file:///c%3A/Test/bug_report/main.cpp (id: 24)
LSP: cpptools/textEditorSelectionChange
LSP: cpptools/activeDocumentChange: file:///c%3A/Test/bug_report/main.cpp

Other Extensions

No response

Additional context

Seems to compile fine in every major compiler, no idea if this casting its allowed in the standard
https://godbolt.org/z/7d7WMTE91

[michelleangela]

Raigorx Hellscream (@raigorx)
Thank you for submitting this issue. I've created an internal bug (1866914) for the IntelliSense engine code base that is shared with Visual Studio.