Function type instance: Go to definition of function type goes to return type

Environment

• OS and Version: Linux x64 6.13.8-arch1-1
• VS Code Version: 1.98.2
• C/C++ Extension Version: 1.24.3
• If using SSH remote, specify OS of remote machine:

Bug Summary and Steps to Reproduce

Bug Summary:
With this minimal example of defining a function type, declaring an instance of this type, and finally defining this function, one of the examples fails to go to definition (F12) or show it upon hover:

using Foo = void;
using RetFoo = Foo();
RetFoo retFoo; // hover wrong: using Foo = void
Foo retFoo() {}

RetFoo retFooUndefined; // hover correct: using RetFoo = Foo ()

using RetVoid = void();
RetVoid retVoid; // hover correct: using RetVoid = void ()
void retVoid() {}

Instead of showing the definition of the (function) type, it shows the return type of the function.

It only happens:

• when the function definition has been added.
• If the return type is not a fundamental such as void or int

Steps to reproduce:

1. Open the code above in the editor
2. Go to definition of RetFoo in the declaration RetFoo retFoo;

Configuration and Logs

-------- Diagnostics - 3/27/2025, 8:00:29 PM
Version: 1.24.3
Current Configuration:
{
    "name": "Linux",
    "includePath": [
        "${workspaceFolder}/**"
    ],
    "defines": [],
    "cStandard": "c17",
    "cppStandard": "c++17",
    "intelliSenseMode": "linux-clang-x64",
    "intelliSenseModeIsExplicit": false,
    "cStandardIsExplicit": false,
    "cppStandardIsExplicit": false,
    "mergeConfigurations": false,
    "compilerPath": "/usr/bin/g++",
    "compilerPathIsExplicit": true,
    "browse": {
        "limitSymbolsToIncludedHeaders": true
    }
}
Modified Settings:
{
    "C_Cpp.default.compilerPath": "/usr/bin/g++",
    "C_Cpp.codeAnalysis.clangTidy.enabled": true,
    "C_Cpp.codeAnalysis.clangTidy.checks.enabled": [
        "cppcoreguidelines-*",
        "performance-*",
        "modernize-*"
    ],
    "C_Cpp.codeAnalysis.clangTidy.checks.disabled": [
        "altera-id-dependent-backward-branch",
        "altera-unroll-loops",
        "android-*",
        "bugprone-easily-swappable-parameters",
        "bugprone-implicit-widening-of-multiplication-result",
        "cert-dcl58-cpp",
        "cert-err33-c",
        "cppcoreguidelines-avoid-magic-numbers",
        "cppcoreguidelines-non-private-member-variables-in-classes",
        "cppcoreguidelines-pro-bounds-pointer-arithmetic",
        "cppcoreguidelines-pro-type-reinterpret-cast",
        "cppcoreguidelines-pro-type-vararg",
        "fuchsia-*",
        "google-readability-*",
        "google-runtime-int",
        "hicpp-vararg",
        "llvm-header-guard",
        "llvmlibc-*",
        "misc-include-cleaner",
        "misc-non-private-member-variables-in-classes",
        "performance-unnecessary-value-param",
        "readability-identifier-length",
        "readability-magic-numbers"
    ],
    "C_Cpp.loggingLevel": "Debug",
    "C_Cpp.autoAddFileAssociations": false
}
Additional Tracked Settings:
{
    "editorTabSize": 4,
    "editorInsertSpaces": true,
    "editorAutoClosingBrackets": "languageDefined",
    "filesEncoding": "utf8",
    "filesAssociations": {},
    "filesExclude": {
        "**/.git": true,
        "**/.svn": true,
        "**/.hg": true,
        "**/.DS_Store": true,
        "**/Thumbs.db": true
    },
    "filesAutoSaveAfterDelay": false,
    "editorInlayHintsEnabled": true,
    "editorParameterHintsEnabled": true,
    "searchExclude": {
        "**/node_modules": true,
        "**/bower_components": true,
        "**/*.code-search": true
    },
    "workbenchSettingsEditor": "ui"
}
cpptools version (native): 1.24.3.0
Current database path: /tmp/{8585037B-B0F4-4459-99C4-3FBEE7EA3BC6}/.browse.VC.db
Translation Unit Mappings:
[ /home/per/ftype.hpp - source TU]:
Translation Unit Configurations:
[ /home/per/ftype.hpp ]
    Process ID: 960004
    Memory Usage: 20 MB
    Compiler Path: /usr/bin/g++
    Include paths:
        system include: /usr/include/c++/14.2.1
        system include: /usr/include/c++/14.2.1/x86_64-pc-linux-gnu
        system include: /usr/include/c++/14.2.1/backward
        system include: /usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include
        system include: /usr/local/include
        system include: /usr/lib/gcc/x86_64-pc-linux-gnu/14.2.1/include-fixed
        system include: /usr/include
    Standard Version: c++17
    IntelliSense Mode: linux-gcc-x64
    Other Flags:
        --g++
        --gnu_version=140201
Total Memory Usage: 20 MB

------- Workspace parsing diagnostics -------
Number of files discovered (not excluded): 38903

Other Extensions

No response

Additional context

No response

Inizia con la riproduzione minima in ftype.hpp e riproduci F12 e l'hover su RetFoo nella dichiarazione di retFoo usando la configurazione Linux, C++17 e g++ indicata. Traccia la ricerca della definizione per l'alias del tipo funzione e verifica che venga risolta in using RetFoo = Foo() anziché nel tipo restituito, inclusi i casi segnalati in cui la definizione della funzione esiste e il tipo restituito non è fondamentale.