Yeah, but with C's old-school int values for errors, you can always make an equality comparison. The error interface in Go doesn't specify equality, so you can

Yeah, but with C's old-school int values for errors, you can always make an equality comparison. The error interface in Go doesn't specify equality, so you can do "if err == io.EOF" in some cases and you're up a creek in other cases. Sure you can do if err.Error() == "String I'm expecting", but as the parent said, fmt.Errorf can easily make that impossible.