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  1. or download this
    "my" variable $x masks earlier declaration in same scope at 585826.pl 
+line 4.
"my" variable $x masks earlier declaration in same scope at 585826.pl 
+line 6.
...
print __LINE__ . ": " . \$x . " = $x \n";
my $x;
print __LINE__ . ": " . \$x . " = $x \n";
  2. or download this
    1: SCALAR(0x0225fc4) =
3: SCALAR(0x022603c) = 123
5: SCALAR(0x1830b1c) = 456
7: SCALAR(0x1830ba0) =