{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"TyKind::Dyn(dyn_ty)"}]}
            TyKind::Dyn(dyn_ty) => dyn_ty.bounds.skip_binders().interned().first().and_then(|b| {
            // here.
                match b.skip_binders() {