variadic template parameter pack expanding for function calls

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Unfortunately, as you noticed, expanding a parameter pack is only valid in certain contexts where the parser expects a comma-separated list of entries – contexts where the comma is just a syntactic separator, not the comma operator. This is arguably a deficiency in the current text.

An ugly workaround:

func((some(p), 0)...);

Do note that the evaluation order of function arguments, and thus the order of the some invocations, is unspecified, so you have to be careful with any side effects.

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