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Stack graphs is the formalism that we've put together at GitHub to power Precise Code Navigation. It's based on the scope graphs framework from Eelco Visser's group at TU Delft.
We have published one paper about stack graphs so far.
[Creager2023] Stack graphs: Name resolution at scale
Kutsia2007 describes sequence unification, which is the unification strategy we use in the stack graph partial path stitching algorithm. §6.3, in particular, shows that sequence unification is unitary if “sequence variables occur only in the last argument positions in terms”.
[Kutsia2007] Solving equations with sequence variables and sequence functions
2022-09-19: Kleffner's talk on stack language typing
2022-08-30: Python stack graphs