X is prosecuted for perjury. X previously had been convicted of assault with a deadly weapon and sentenced to prison. X filed a habeas corpus petition, alleging that he had entered a plea of guilty to the assault charge because A, his lawyer, had assured him that the judge, with the prosecutor's concurrence, had agreed to a county jail sentence. In the habeas corpus proceeding, A denied giving X any such assurance. The perjury prosecution is based on X's allegations in the habeas corpus petition. At the perjury trial, the prosecutor calls A to testify to the communications between him and X when he represented X on the assault charge. X claims the lawyer-client privilege to prevent A's testimony, what result?