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sub get_data {
   ...;
   return;   # undef in scalar context or the empty list in list conte
+xt
}

sub get_data {
   ...;
   return undef;   # undef in scalar context and a one-item list conta
+ining undef in list context
}

  sub enable_warnings {
    my $self = shift;
...
# We can do this:

my $result = $widget->enable_warnings->enable_errors->run_process;

sub bleh {
  return $result;
}

sub bleh {
  $result;
}