unicode/utf8: use strings.Builder

Change-Id: I88b55f61eccb5764cac2a9397fd99a62f8735a9a
Reviewed-on: https://go-review.googlesource.com/c/go/+/428281
Reviewed-by: Ian Lance Taylor <iant@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>

diff --git a/src/unicode/utf8/utf8_test.go b/src/unicode/utf8/utf8_test.go
index e7c31222cca090541f7059b9174cd9ff05114972..19a04dc92e7fd83649b1ebd5448bb811a2986a51 100644 (file)
--- a/src/unicode/utf8/utf8_test.go
+++ b/src/unicode/utf8/utf8_test.go
@@ -626,7 +626,7 @@ var longStringJapanese string    // ~100KB, non-ASCII
 
 func init() {
        const japanese = "日本語日本語日本語日"
-       var b bytes.Buffer
+       var b strings.Builder
        for i := 0; b.Len() < 100_000; i++ {
                if i%100 == 0 {
                        b.WriteString(japanese)