What's the reason for such kind of behavior of perl5db.pl?

PerlOnTheWay has asked for the wisdom of the Perl Monks concerning the following question:

DB<4> s
URI::CODE(0x7f8b0e83b600)(/usr/lib/perl5/site_perl/5.8.8/URI.pm:3):
3:      use strict;
DB<4> l
3==>    use strict;
DB<4> l
3==>    use strict;
DB<4> l
3==>    use strict;
DB<4> l
3==>    use strict;
DB<4> s
URI::CODE(0x7f8b0e83b600)(/usr/lib/perl5/site_perl/5.8.8/URI.pm:3):
3:      use strict;
DB<4> n
URI::CODE(0x7f8b0e83b600)(/usr/lib/perl5/site_perl/5.8.8/URI.pm:3):
3:      use strict;
DB<4> n
[download]

What seems strange is that it doesn't increment the line no for consecutive l, and I need to press n twice to make it step forward.

I've met this kind of issue many times, is there anyone that knows the reason?

Comment on What's the reason for such kind of behavior of perl5db.pl? Select or Download Code

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Re: What's the reason for such kind of behavior of perl5db.pl? by chrestomanci (Priest) on Sep 21, 2011 at 09:10 UTC
Have you changed the setup of the perl debugger so as to set a break point before code is compiled? I have seen similar strange behaviour by setting a break point in a begin block: `BEGIN: { $DB:single = 1; }; # Rest of the script here` [download]	[reply] [d/l]
Re^2: What's the reason for such kind of behavior of perl5db.pl? by PerlOnTheWay (Monk) on Sep 21, 2011 at 14:04 UTC
No special settings, it's started simply by `perl -d`	[reply] [d/l]