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  1. or download this
     
D:\temp>perl -MO=Deparse -e "my $b = 1 for 1 .. 10"
;
...
-e syntax OK

D:\temp>
  2. or download this
    P:\test>perl -wl
my $a = 'a' x 10;
...
print $main::b;
^Z
Use of uninitialized value in print at - line 3.