{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"ProjectionElem::Downcast(_idx)"}]}
                ProjectionElem::Downcast(_idx) => {}
                ProjectionElem::Subslice { from: _, to: _, from_end: _ } => {}
                ProjectionElem::OpaqueCast(ty) => self.visit_ty(ty, location),