var os.ErrExist

5 uses

	os (current package)
		error.go#L22: 	ErrExist      = fs.ErrExist      // "file already exists"
		error.go#L81: 	return underlyingErrorIs(err, ErrExist)
		tempfile.go#L54: 			return nil, &PathError{Op: "createtemp", Path: prefix + "*" + suffix, Err: ErrExist}
		tempfile.go#L108: 			return "", &PathError{Op: "mkdirtemp", Path: prefix + "*" + suffix, Err: ErrExist}

	testing
		testing.go#L2652: 		if err := os.Mkdir(artifactDir, 0o777); err != nil && !errors.Is(err, os.ErrExist) {