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  DB<108> sub inc_a { $_[0]++; return }
 
...
2
  DB<110> inc_a(1)
Modification of a read-only value attempted at (eval 13)[/usr/share/pe
+rl/5.10/perl5db.pl:638] line 2.

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  DB<111> sub inc_b { my $r=\ $_[0]; $$r++; return }
 
...
  DB<113> inc_b(1)
 
  DB<114>