$ perl -de0
Patching with Devel::Command::DBSub::DB_5_8_5

Loading DB routines from perl5db.pl version 1.27
Editor support available.

Enter h or `h h' for help, or `man perldebug' for more help.

main::(-e:1):	0
  DB<1> fx Test::More
Loaded Test::More
auto(-1)  DB<2> f /home/y/lib/perl5/5.8/i386-freebsd-thread-multi/Test/More.pm
1 	package Test::More;
2 	
3:	use 5.004;
4 	
5:	use strict;
6 	
7 	
8 	# Can't use Carp because it might cause use_ok() to accidentally succeed9 	# even though the module being used forgot to use Carp.  Yes, this
10 	# actually happened.
  DB<3>