I can't get va_arg to pull in an argument of type pointer-to-function.
The type-rewriting games which the va_arg macro typically plays are stymied by overly-complicated types such as pointer-to-function. If you use a typedef for the function pointer type, however, all will be well. See also question 1.21.
References:
ANSI Sec. 4.8.1.2
ISO Sec. 7.8.1.2
Rationale Sec. 4.8.1.2
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