{"ast_node_type":"variable","tokens":[{"end":51,"kind":"keyword","start":0,"text":"let"}]}
                let (cb, ib) = self.head("struct");
            hir::ItemKind::Struct(ident, generics, ref struct_def) => {
                self.print_struct(ident.name, generics, struct_def, item.span, true, cb, ib);