The ellipsis statement parses without error, but throws an Unimplemented at … error if actually tried to be executed.
Thus, it can be used to indicate code yet to be implemented.
The ellipsis statement is not to be misstaken for the flip-flop operator (that looks the same: ...)
#!/usr/bin/perl
use warnings;
use strict;
for my $i (1 .. 10) {
print "$i\n";
do_what_i_mean() if $i == 5;
}
sub do_what_i_mean {
# The implementation of this sub is trivial
# and left as an exercise for the reader
... # yada-yada
}