all: append(bytes, str...) works out of the box

all: append(bytes, str...) works out of the box

From the append docs in the builtin package:

	As a special case, it is legal to append a string to a byte slice, like this:

	slice = append([]byte("hello "), "world"...)

Change-Id: Ib14039a7476873b12a3aefccd8863e8d628b9249
Reviewed-on: https://go-review.googlesource.com/c/go/+/425102
Reviewed-by: hopehook <hopehook@qq.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: David Chase <drchase@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>