all: use fmt.Appendf
Change-Id: I45f941ba3db26a12b3f56d93bdcd7f9e1d490346
GitHub-Last-Rev:
22b51167b08a1770a63a8b768a60451bc2ff0dc5
GitHub-Pull-Request: golang/go#56030
Reviewed-on: https://go-review.googlesource.com/c/go/+/438539
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>