{"ast_node_type":"function","tokens":[{"end":63,"kind":"keyword","start":0,"text":"fn"}]}
                fn _test<'tcx>(x: $lifted, tcx: TyCtxt<'tcx>) {
                fn _type_eq<T>(_x: &T, _y: &T) {}
                    // If `x` is a newtype around an `Interned<T>`, then `interner` is an