ID with same name as funtion macro highlighted incorrectly

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
42/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
c, cpp, typescript
Domain
devtools

Research direction

The issue names no source files or tests. Start by reproducing the two C snippets in the C/C++ extension's highlighting context, then trace how identifiers are classified in macro arguments and macro expansions. Done means the typename, parameter, and macro-parameter examples receive the colors described in the report.

Written by the indexing model from the issue text.

Description

bug Feature: Colorization Feature: Hover (Quick Info) Language Service parser Visual Studio

Type: Bug

typedef int A;
#define A()
#define b(a) b(a)
void b(A a);
Image

Here, A in void b(A a); should be green like a typename, but it is purple like a macro.

#define a()
#define b(a) b(a)
void b(int a);
Image

Here, a should be grey like a parameter in void b(int a); and white like a constant in #define b(a) b(a), but it is purple like a macro in both places.

This only occurs when the typename is inside a function macro's arguments or in a macro's expansion definition.

Extension version: 1.31.0
VS Code version: Code 1.109.5 (072586267e68ece9a47aa43f8c108e0dcbf44622, 2026-02-19T19:43:32.382Z)
OS version: Linux x64 6.8.0-100-generic
Modes:

Dominant language
TypeScript
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Forks
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Avg merge
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Merged PRs (30d)
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