{"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"//"}]}
    // the user can explicitly name them. To do this, we would allow some regions whose names
    // We can probably be less conservative, since some inferred free regions are namable (e.g.
    // come from `MatchedAdtAndSegment`, being careful to filter out bad suggestions, such as