add value vithh error

output/writer.go

@@ -41,6 +41,11 @@ func FormatString(_ verbosity.Verbosity, msg string, kv ...label.KeyValue) strin
 
 func New(w io.Writer, format func(verb verbosity.Verbosity, msg string, kv ...label.KeyValue) string) Output {
 	return func(ctx context.Context, verb verbosity.Verbosity, msg string, kv ...label.KeyValue) (int, error) {
-		return fmt.Fprint(w, format(verb, msg, kv...))
+		out, err := fmt.Fprint(w, format(verb, msg, kv...))
+		if err != nil {
+			return 0, fmt.Errorf("writer fprint:%w", err)
+		}
+
+		return out, nil
 	}
 }