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Example of synthesized attribute:


Cross-using rules from each other, different typing (example itself is meaningless by design)

Naive/manual implementation of visiting pattern on grammar:

In a language like C# you implement IJsonVisitor and execute calculation on parse result (int array). Extensions can potentially be implemented using C# extension methods syntax on interface. The problem is their discovery, otherwise they are just static functions which gets interface and node data.

Such visitor can be generated with syntactic sugar:

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