How have courts dealt with a claim that defense counsel provided ineffective assistance?

16 At oral argument, defendant attempted to raise a claim that, in the proceedings recounted in the text, defense counsel provided ineffective assistance, apparently in violation of his rights under the Sixth Amendment to the United States Constitution and article I, section 15 of the California Constitution. He "assert[ed] the point perfunctorily. We deny it in the same fashion." (People v. Ashmus (1991) 54 Cal.3d 932, 1011, fn. 29, 2 Cal.Rptr.2d 112, 820 P.2d 214.)