I even always use Data::Dumper for debugging output. So I can also spot (invisible) control characters, and I can also dump complex data structures for free. To safe key strokes I use an emacs macro for this:
(defun perl-insert-data-dumper ()
(insert "require Data::Dumper; print STDERR \"Line \" . __LINE__ . \
+", File: \" . __FILE__ . \"\\n\" . Data::Dumper->new(,)->Indent(1
+)->Useqq(1)->Dump; # XXX\n")
(define-key global-map [C-f12] 'perl-insert-data-dumper)
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