In Perl:

for my $each_job (@job_list) {
  # Do something, like this...
  $each_job->start();
}

You will note that no declaration exists. And a comment about what you mean by a variable that is in scope for 2 lines which is clear in context is silly to the point of stupidity. (Why add the maintainance overhead if its purpose is that clear?)

Cheers,
Ben