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This is building off of #514 -- a much more manageable AST change. There are only two significant changes to the AST from 5.2 to 5.3: the addition of a dedicated effects AST node and constant nodes getting a location. The latter will likely be the most impacting change to downstream dependencies of ppxlib.
Of course, we need to get #514 in first, but this is ready for when we want to make the next change and catch up with ocaml/ocaml, from there we should be able to have a more regular AST bump cadence (depending on how the parsetree changes).