// insignificant space characters elided.
func Compact(dst *bytes.Buffer, src []byte) error {
	dst.Grow(len(src))
	b := dst.AvailableBuffer()
	b, err := appendCompact(b, src, false)
	dst.Write(b)
	return err
}

func appendCompact(dst, src []byte, escape bool) ([]byte, error) {
	origLen := len(dst)
	scan := newScanner()
	defer freeScanner(scan)
	start := 0
	for i, c := range src {

	}
	m, ok := v.Interface().(Marshaler)
	if !ok {
		e.WriteString("null")
		return
	}
	b, err := m.MarshalJSON()
	if err == nil {
		e.Grow(len(b))
		out := e.AvailableBuffer()
		out, err = appendCompact(out, b, opts.escapeHTML)
		e.Buffer.Write(out)
	}
	if err != nil {
		e.error(&MarshalerError{v.Type(), err, "MarshalJSON"})
	}
}