https://dlang.org/phobos/core_vararg.html
The common way to use **va_arg** is `va_arg!(int)(_argptr);`What would be the alternative way or syntax that behave exactly the same way, even if more verbose?
____ `va_arg!(int)(_argptr);` is taken from an example in: https://dlang.org/spec/function.html#d_style_variadic_functions