This takes place when a nonterminal violates the single responsibility principle, and represents several (hopefully related) abstractions, such as a type name and a variable name.
Mats Stijlaart and Vadim Zaytsev. 2017. Towards a taxonomy of grammar smells. In Proceedings of the 10th ACM SIGPLAN International Conference on Software Language Engineering (SLE 2017). ACM, New York, NY, USA, 43-54.
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