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4.10 Formal Parameter Lists

FunnelWeb allows macros to have up to nine macro parameters, named `@1`, `@2`, ..., `@9`. If a macro does not have a formal parameter list, it is defined to have no parameters, and an actual parameter list must not appear at the point of call. If a macro has a formal parameter list, it is defined to have one or more parameters, and a corresponding actual parameter must be supplied for each formal parameter, at the point of call.

Because FunnelWeb parameters have predictable names, the only information that a formal parameter list need convey is how many parameters a macro has. For this reason a formal parameter list takes the form of the highest numbered formal parameter desired, enclosed in parentheses sequences.

    formal_parameter_list = "@(" formal_parameter "@)".
    formal_parameter = "@1" | "@2" | "@3" | "@4" | "@5" |
                       "@6" | "@7" | "@8" | "@9"

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