bytes.IndexByte can be used wherever the second argument to strings.Index is exactly one byte long, so we do that with this change. This avoids generating unnecessary string symbols/converison and saves a few calls to bytes.Index. Change-Id: If31c775790e01edfece1169e398ad6a754fb4428 Reviewed-on: https://go-review.googlesource.com/66373 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>v1.2.3