func (b *Builder) Grow(n int) {
	b.copyCheck()
	if n < 0 {
		panic("strings.Builder.Grow: negative count")
	}
	if cap(b.buf)-len(b.buf) < n {
		b.grow(n)
	}
}

// Write appends the contents of p to b's buffer.
// Write always returns len(p), nil.
func (b *Builder) Write(p []byte) (int, error) {
	b.copyCheck()
	b.buf = append(b.buf, p...)
	return len(p), 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)
		b.WriteString("abcde")
		_ = b.String()
	})
	if n != 1 {