i I try this code example on my computer with Perl 5.6.1 and i have one error :-)
Too many arguments for Debug::doit at ./test.pl line 9, near "};" Execution of ./test.pl aborted due to compilation errors.
some consultation with my friend gildir. Problem is simple.
use Debug(1);
print "Start\n";

DEBUG { print "debug me"; }

# mising ';' at end of line
# correct is

DEBUG { print "debug me"; };

Mamut