Eh, no, it's using a prototype to act as Perl buildins....
Remember that by default, subroutine calls gobble up all the
arguments (unless there are parens), except subroutines
that are prototypes to take zero or one argument.
Witness:
#!/usr/bin/perl -w
use strict;
sub all {print "@_\n"};
sub gobble_no_proto {return};
sub gobble_proto ($) {return};
all "foo", "bar", gobble_no_proto "baz", "quux", "fluff";
all "foo", "bar", gobble_proto "baz", "quux", "fluff";
__END__
foo bar
foo bar quux fluff
See the difference?
Abigail
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