{"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"ty::BoundRegionKind::NamedAnon(_)"}]}
            ty::BoundRegionKind::NamedAnon(_) => bug!("only used for pretty printing"),
            ty::BoundRegionKind::ClosureEnv => BoundRegionKind::BrEnv,
        }