Something like this? (simplified...)
#!/usr/bin/perl
use strict;
use warnings;
my $self = 'cat';
print "outside $self\n";
{
my $self = $self;
print " inside $self\n";
$self = 'dog' if not defined $ARGV[0];
print " inside $self\n";
}
print "outside $self\n";
Outputs:
outside cat
inside cat
inside dog
outside cat
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