https://issues.dlang.org/show_bug.cgi?id=23567

          Issue ID: 23567
           Summary: pragma(printf) messes up with the vtable of
                    extern(C++) classes
           Product: D
           Version: D2
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: naydef@abv.bg

assertion fails on DMD 2.101.1
assertion passes on DMD 2.100.2

app.d
-------------------------------------------------------
extern(C++) abstract class CCvar
{
public:
    pragma(printf) void func1(const(char)* pFormat, ...);
    pragma(printf) void func2(const(char)* pFormat, ...);
}

static assert(__traits(getVirtualIndex, CCvar.func2) == 1);
pragma(msg, __traits(getVirtualIndex, CCvar.func2));

void main() {}
-------------------------------------------------------

dmd -o- app.d


Thanks to CyberShadow for bisecting. Issue introduced in https://github.com/dlang/dmd/pull/14503

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