Visualizing Macro Expansion in Visual Studio
summary
A new Visual Studio 2022 version 17.7 feature shows preprocessor output one expansion step at a time, rendering nested macros like Unreal Engine GENERATED_BODY into a navigable list of transformation steps with back and forward arrows and double arrows to jump to first or last expansion. The tool opens an expansion window, highlights each substitution, and exposes where tokens are inserted or removed so debugging macro-bloat or name collisions pinpoints the exact expansion step that caused the problem.
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