main::((eval 8)[evals.pl:15]:1): 

##</code><code>##

pp2@nereida:~/src/perl/testing$ cat -n evals.pl
     1  use strict;
     2  use warnings;
     3
     4  my ($a, $b) = (1, 9);
     5
     6  my $x = eval q {
     7    $a = 2;
     8    $b = 3;
     9    print "$b\n";
    10    $a+$b;
    11  };
    12
    13
    14
    15  my $y = eval '$a+$b';
    16
    17  print "$y\n";

##</code><code>##

pp2@nereida:~/src/perl/testing$ perl -wd evals.pl

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

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

main::(evals.pl:4):     my ($a, $b) = (1, 9);
  DB<1> c 6
main::(evals.pl:6):     my $x = eval q {
main::(evals.pl:7):       $a = 2;
main::(evals.pl:8):       $b = 3;
main::(evals.pl:9):       print "$b\n";
main::(evals.pl:10):      $a+$b;
  DB<2> n
main::((eval 6)[evals.pl:6]:2):   $a = 2;
  DB<2> l (eval 6)
1
2==>      $a = 2;
3:        $b = 3;
4:        print "$b\n";
5:        $a+$b;
6
7       ;

##</code><code>##

  DB<3> c 15
Line 15 not breakable.

##</code><code>##

  DB<4> f evals.pl
1:      use strict;
2:      use warnings;
3
4:      my ($a, $b) = (1, 9);
5
6:      my $x = eval q {
7         $a = 2;
8         $b = 3;
9         print "$b\n";
10        $a+$b;
  DB<5> c 15
3
main::(evals.pl:15):    my $y = eval '$a+$b';
  DB<6> n
main::((eval 8)[evals.pl:15]:1):        $a+$b
  DB<6> l (eval 8)
1==>    $a+$b
2       ;
  DB<7> c
5
Debugged program terminated.  Use q to quit or R to restart,
  use o inhibit_exit to avoid stopping after program termination,
  h q, h R or h o to get additional info.
  DB<7>