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As usual, turn in only one solution per group.
Design and implement the necessary extensions to the PL/0 parser and AST class hierarchy to parse and represent the extended PL/0 language. Use the project description and extended BNF description (available after assignment #2 is submitted) as the language definition.
Thinking carefully about the AST extensions will pay off. One particular pitfall to avoid: an array of arrays is not a 2-D array; PL/0 only has 1-D arrays (whose elements can be of any type, including array).