Find All References on a variable template returns nothing

[lukka]

Environment

cpptools — Find All References on the variable template ex::zeroValue returns nothing

Field	Value
Symbol (spec id)	var-template-zeroValue
Declaration	template <class T> constexpr T zeroValue = T(0); (variable template)
Query position	src/extras.h:22:13 (cursor on zeroValue)
Affected LSP request	textDocument/references
Repro archive	P1-var-template-zeroValue.zip (this folder)

Summary

Find All References on the variable template ex::zeroValue returns no references in VS Code with the C/C++ extension (cpptools), missing both instantiation uses. The symbol appears unused even though it is instantiated twice.

Environment

• Editor: Visual Studio Code 1.33.5
• Extension: C/C++ (ms-vscode.cpptools), default IntelliSense engine
• Language standard: C++20 (freestanding fixture; no STL/toolchain required)

Steps to reproduce

1. Extract P1-var-template-zeroValue.zip and open the cpp-project folder in VS Code (C/C++ extension enabled).
2. Optionally configure with CMake Tools (preset cdb); the fixture also parses under default C++20 IntelliSense.
3. Open src/extras.h, place the cursor on zeroValue in constexpr T zeroValue = T(0); (line 22, col 13).
4. Invoke Find All References (Shift+Alt+F12).

Expected vs actual

Source	Result count
Expected	3
VS Code / cpptools	0 (no references)

Expected (3): the template declaration (extras.h:22) and its two instantiation uses in main() — ex::zeroValue<int> (main.cpp:150) and ex::zeroValue<double> (main.cpp:151).

Actual (0): "Find All References" reports no results (the instantiation uses are not found).

Why it matters

A false "no references" on a live symbol is high risk: an automated agent (or a developer) can conclude the variable template is dead and delete it, breaking the two instantiations.

Bug Summary and Steps to Reproduce

P1-var-template-zeroValue.zip