var b Builder
	if err := b.WriteByte('a'); err != nil {
		t.Error(err)
	}
	if err := b.WriteByte(0); err != nil {
		t.Error(err)
	}
	check(t, &b, "a\x00")
}

func TestBuilderAllocs(t *testing.T) {
	// Issue 23382; verify that copyCheck doesn't force the
	// Builder to escape and be heap allocated.
	n := testing.AllocsPerRun(10000, func() {
		var b Builder
		b.Grow(5)