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(nasm.info)Section 4.3.5

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4.3.5. `%0': Macro Parameter Counter
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   For a macro which can take a variable number of parameters, the
parameter reference `%0' will return a numeric constant giving the
number of parameters passed to the macro. This can be used as an
argument to `%rep' (see *Note Section 4.5::) in order to iterate
through all the parameters of a macro. Examples are given in *Note
Section 4.3.6::.