balazske added a comment. So the problem is that there are references to `ParmVarDecl` from inside function body and at import of `ParmVarDecl` always a new one is created even if there is an already existing (in the existing function prototype)? Maybe it works in `VisitParmVarDecl` to search for already existing `ParmVarDecl` (not already imported) and return if found.
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