{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"self.tcx.supertrait_vtable_slot((src_pointee_ty,"}]}
                    self.tcx.supertrait_vtable_slot((src_pointee_ty, dest_pointee_ty));
                let vptr_entry_idx =
                let vtable_entries = self.vtable_entries(data_a.principal(), ty);