C:\>perl -demo

Loading DB routines from perl5db.pl version 1.28
Editor support available.

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

main::(-e:1):   mo
  DB<1> for (-1..1) { print "$_"; print "\tTrue" if ($x = $_); print "\n" }
-1      True
0
1       True

  DB<2>