{"ast_node_type":"other","tokens":[{"end":73,"kind":"keyword","start":0,"text":"CanonicalVarKind::PlaceholderRegion(ty::Placeholder"}]}
                    CanonicalVarKind::PlaceholderRegion(ty::Placeholder {
                CanonicalVarKind::PlaceholderRegion(placeholder) => {
                        universe: reverse_universe_map[&placeholder.universe],