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my $hash = {};

...

    print Dumper( $hash );
}

{
  'a' => 'alpha',
  'b' => 'beta'
}
{}

do_something_else( $hash );
print Dumper( $hash );
...

    print Dumper( $hash );
}

{
  'd' => 'delta',
...
  'd' => 'delta',
  'g' => 'gamma'
}