{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"AngleBracketedArg::Constraint(c)"}]}
            AngleBracketedArg::Constraint(c) => {
            AngleBracketedArg::Arg(_) => None,
                Some(pprust::to_string(|s| s.print_assoc_item_constraint(c)))