EX3: Adverbs and print()

[John Siracusa]

>From EX3:
> A subroutine's adverbs are specified as part of its normal parameter list, but
> separated from its regular parameters by a colon:
>
> my sub operator:� is prec(\&operator:+($)) ( *@list : $filter //= undef)
> { ...
>
> This specifies that operator:� can take a single scalar adverb, which is bound
> to the parameter $filter. When there is no adverb specified in the call,
> $filter is default-assigned the value undef.

So, in the � operator, the filter is the adverb:

    $sum = � @costs : {$^_ < 1000};

Does that mean that in the built-in print, the file handle is the only
"in-band" argument, and all the actual items to be printed are merely
adverbs?

    print $data.{fh} : $data.{qw(name vers stat)}, _@{$data.{costs}}, $rest;

Or am I confusing uses of the colon?

-John