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b $var        Set breakpoint at first line of 
              subroutine referenced by $var.

$ cat namevsref.pl
use warnings;
...

$x->();
tutu();

pp2@nereida:~/src/perl/testing$ perl -wd namevsref.pl

...
  use o inhibit_exit to avoid stopping after program termination,
  h q, h R or h o to get additional info.
  DB<5>