rjmccall added a comment. Thanks. Having an enum like this would also be important if we wanted to implement the Itanium rule (as in, the actual Itanium architecture, not the generic C++ ABI) that v-tables contain "inline" function descriptors rather than pointers to them. (On Itanium, a C function pointer is actually a pointer to a global descriptor object that's a pair of a function address and some other metadata necessary for the call.) So it's a generalizable concept.
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