syntax_data: {"ast_node_type":"function","tokens":[{"end":73,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn universe_of_ty(&self, ty: ty::TyVid) -> Option<ty::UniverseIndex>;
context_after:     fn universe_of_lt(&self, lt: ty::RegionVid) -> Option<ty::UniverseIndex>;