75b39e7909
Originally we didn't bother to mark FuncExprs with any indication whether VARIADIC had been given in the source text, because there didn't seem to be any need for it at runtime. However, because we cannot fold a VARIADIC ANY function's arguments into an array (since they're not necessarily all the same type), we do actually need that information at runtime if VARIADIC ANY functions are to respond unsurprisingly to use of the VARIADIC keyword. Add the missing field, and also fix ruleutils.c so that VARIADIC ANY function calls are dumped properly. Extracted from a larger patch that also fixes concat() and format() (the only two extant VARIADIC ANY functions) to behave properly when VARIADIC is specified. This portion seems appropriate to review and commit separately. Pavel Stehule
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