Worked on stabilizing the C++ front-end in the rust-lang/gcc repository by addressing a parsing issue that caused an internal compiler error when struct declarations appeared in function parameters within class scopes. The solution involved refining the C++ parsing logic to ensure a specific flag was not incorrectly set during struct body definition parsing, thereby preventing assertion failures. Added a targeted regression test to verify the fix and protect against future regressions. This work, focused on bug fixing and compiler development using C++, improved the reliability of C++ code parsing and reduced continuous integration failures and user-reported crashes in the project.