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  1. or download this
    Perl has a very handy construction
  {
...
    ...
    $var = $oldvar;
  }
  2. or download this
    D:\>perl -lwe "$var='qq';{local $var=2;print $var;}print $var"
2
qq
  3. or download this
    D:\>perl -lwe "my $var='qq';{local $var=2;print $var;}print $var"
Can't localize lexical variable $var at -e line 1.