return nil
	}
	pos0 := m.rand(len(b))
	pos1 := pos0 + m.chooseLen(len(b)-pos0)
	copy(b[pos0:], b[pos1:])
	b = b[:len(b)-(pos1-pos0)]
	return b
}

// byteSliceInsertRandomBytes inserts a chunk of random bytes into b at a random
// position.
func byteSliceInsertRandomBytes(m *mutator, b []byte) []byte {
	pos := m.rand(len(b) + 1)
	n := m.chooseLen(1024)
	if len(b)+n >= cap(b) {
		return nil
	}
	b = b[:len(b)+n]

}

func (m *mutator) randByteOrder() binary.ByteOrder {
	if m.r.bool() {
		return binary.LittleEndian
	}
	return binary.BigEndian
}

// chooseLen chooses length of range mutation in range [1,n]. It gives
// preference to shorter ranges.
func (m *mutator) chooseLen(n int) int {
	switch x := m.rand(100); {
	case x < 90:
		return m.rand(min(8, n)) + 1
	case x < 99:
		return m.rand(min(32, n)) + 1
	default:

  write_action_env_to_bazelrc('PYTHON_LIB_PATH', python_lib_path)
  write_to_bazelrc('build --python_path=\"{}"'.format(python_bin_path))
  environ_cp['PYTHON_BIN_PATH'] = python_bin_path

  # If choosen python_lib_path is from a path specified in the PYTHONPATH
  # variable, need to tell bazel to include PYTHONPATH
  if environ_cp.get('PYTHONPATH'):
    python_paths = environ_cp.get('PYTHONPATH').split(':')