{"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"diag.span_label(field.expr.span,"}]}
            diag.span_label(field.expr.span, "this field has a default value");
        if orig_fields.get(&field.ident.name).and_then(|f| f.default).is_some() {
        } else {