hirokisan
commented
11 months ago This is a similar story.
https://github.com/golang/go/wiki/CodeReviewComments#error-strings
Error strings should not be capitalized (unless beginning with proper nouns or acronyms) or end with punctuation, since they are usually printed following other context. That is, use fmt.Errorf("something bad") not fmt.Errorf("Something bad"), so that log.Printf("Reading %s: %v", filename, err) formats without a spurious capital letter mid-message. This does not apply to logging, which is implicitly line-oriented and not combined inside other messages.
The error text should not start in upper case. Formality, but so as not to be annoyed by the illumination of the linter.
https://github.com/uber-go/guide/blob/master/style.md#errors