Comments in the tree mess up all sorts of things. cf #371, #393, and others. We currently have to either make them into the lowest common denominator and add every scoped variable used anywhere to them, or make queries needlessly specific in what they'll match, which couples them overly tightly to the grammar and in any case doesn't work out so well for adjacency patterns (the ones with .s in them).

Most or all comments are unnecessary to stack graph rules, in that we aren't trying to resolve name lookups in or through them (although maybe we would want to jump to definition from within doctests or documentation comments), so maybe we could filter them out of the tree altogether?