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John van Groningen authored
the frontend of the compiler assumes the MatchNode yields a tuple without dictionaries, so after adding the dictionaries the tuple selectors select incorrect values. it would be better to fix this in the frontend, but it is easier in the backend, therefore the code generator computes the number of dictionaries by subtracting the arity of the result of the match node from the arity of the constructor, and pops the dictionaries from the stack.
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