{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"FlowHandler::MatchResult"}]}
        FlowHandler::MatchResult { .. } => {
        FlowHandler::MatchOption { .. } => make::expr_path(make::ext::ident_path("None")),
            let expr = arg_expr.unwrap_or_else(make::ext::expr_unit);