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sub get_string {
  return "the string"
...
# Can I reduce the following two lines to one
my $string = get_string();
&put_string_ref(\$string);

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put_string_ref(\{get_string()});
put_string_ref(\${get_string()});
put_string_ref(\$&get_string);
put_string_ref(\{&get_string});