{"ast_node_type":"variable","tokens":[{"end":45,"kind":"keyword","start":0,"text":"let"}]}
                let (cb, ib) = self.head("");
            hir::ItemKind::Fn { ident, sig, generics, body, .. } => {
                self.print_fn(sig.header, Some(ident.name), generics, sig.decl, &[], Some(body));