in reply to "my" variable masks earlier declaration in same scope

my $var;
$var=1;
my $var;
$var=2;

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The second $var "masks earlier declaration in same scope". You declare the same variable name a second time.

s$$([},&%#}/&/]+}%&{})*;#$&&s&&$^X.($'^"%]=\&(|?*{%
+.+=%;.#_}\&"^"-+%*).}%:##%}={~=~:.")&e&&s""`$''`"e

In Section Seekers of Perl Wisdom