code: @Inline(value="$1.pow($2)")
  	@Pure
  	public static BigInteger operator_power(BigInteger a, int exponent) {
  		return a.pow(exponent);
  	}
docs: The <code>power</code> operator.
  
  @param a
  a BigInteger. May not be <code>null</code>.
  @param exponent
  the exponent.
  @return <code>a.pow(b)</code>
  @throws NullPointerException
  if {@code a} <code>null</code>.