An important extension to the ANSI-C syntax is to allow macros with variable (optional) arguments. FWEB macros with a variable number of arguments are indicated by an ellipsis, as in
@m VAR(x,y,z,...) text
The tokens #0
(number of variable arguments), #
n
(value of the nth optional argument), and
#.
(comma-delimited list of
the optional arguments) are useful in this context.