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3.4.14 first-for? - detect first iteration

Usage: (first-for? [ for_var ])
Returns SCM_BOOL_T if the named FOR loop (or, if not named, the current innermost loop) is on the first pass through the data. Outside of any FOR loop, it returns SCM_UNDEFINED, see FOR - Emit a template block multiple times.

Arguments:
for_var - Optional - which for loop