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(defun perl-dbg ()
  "Insert a debugging print statement"
...
  (search-backward "[ "))

(global-set-key "\C-c\C-p" 'perl-dbg)

use Data::Dumper qw( Dumper );
warn Dumper [ ];

(defun perl-dbg (name)
  "Insert a debugging print statement"
...
  (insert "use Data::Dumper qw( Dumper );\nwarn Dumper ")
  (insert name)
  (insert ";\n"))