Tiny Structure Editors for Low, Low Prices! http://people.cs.uchicago.edu/~rchugh/static/papers/vlhcc20-tse.pdf (fun paper from 2020 IEEE Symposium on Visual Languages and Human-Centric Computing)

Presentation vid (5 mins): http://people.cs.uchicago.edu/~brianhempel/Tiny_Structure_Editors_for_Low_Low_Prices_5mins.mp4

absolutely love the idea of deferred concatenation as the mechanism... really evokes the idea of an ast in a structured editor as a continuation of user input whose default value is its last value