Dealing with layout and whitespace can be very tricky, and, as any tricky process, there may be issues with it. Not specifying any layout may be harmful in some cases as well.
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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