$ cat carliz-ranks
@ranks[@sorted_positions] = (0 .. $#sorted_positions);

$ ppi_dumper -W carliz-ranks
PPI::Document
  PPI::Statement
    PPI::Token::Symbol          '@ranks'
    PPI::Structure::Subscript   [ ... ]
      PPI::Statement::Expression
        PPI::Token::Symbol      '@sorted_positions'
    PPI::Token::Operator        '='
    PPI::Structure::List        ( ... )
      PPI::Statement::Expression
        PPI::Token::Number      '0'
        PPI::Token::Operator    '..'
        PPI::Token::ArrayIndex          '$#sorted_positions'
    PPI::Token::Structure       ';'
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