~$ perl -de0

Loading DB routines from perl5db.pl version 1.77
Editor support available.

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

main::(-e:1):	0
  DB<1> p $]
5.038002
  DB<2> use B::Deparse

  DB<3> p B::Deparse->new->coderef2text(sub{})
{
    use feature 'current_sub', 'bitwise', 'evalbytes', 'fc', 'isa', 'module_true', 'postderef_qq', 'say', 'signatures', 'state', 'unicode_strings', 'unicode_eval';
    
}
  DB<4>