discussed Cited "see, e.g." United States v. Reyes See, e.g., United States v. Wall, 349 F.3d 18, 27 (1st Cir.2003) (barring collateral challenges to prior state convictions in federal sentencing proceedings for any reason other than lack of counsel, and thus applying in the guidelines context the rule of Custis v. United States, 511 U.S. 485 , 114 S.Ct. 1732 , 128 L.Ed.2d 517 (1994)), cert. denied, — U.S. -, 124 S.Ct. 1727 , 158 L.Ed.2d 410 (2004); United States v. Delgado, 288 F.3d 49 , 52 n. 4 (1st Cir.2002) (similar); Brackett v. United States, 270 F.3d 60, 65 (1st Cir.2001) (similar). 1 On appeal, Reyes argues that the district court er…