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  1. or download this
    $ perl -e 'my $1;'
Can't use global $1 in "my" at -e line 1, near "my $1"
...
$ perl -e 'my $1 = 42;'
Can't use global $1 in "my" at -e line 1, near "my $1 "
Execution of -e aborted due to compilation errors.
  2. or download this
    use diagnostics;