{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"placeholder_span.unwrap_or(arg.expr.span).with_ctxt(macsp.ctxt());"}]}
                    placeholder_span.unwrap_or(arg.expr.span).with_ctxt(macsp.ctxt());
                let placeholder_span =
                let arg_span = match arg.kind {