"Justice Thomas delivered the opinion of the Court and dismantled the Yard-Man presumption. In Yard-Man, the Sixth Circuit professed to apply traditional rules for contract interpretation in finding that retiree medical benefits ... had vested.... The Supreme Court found that the Yard-Man inference violates ordinary contract principles 'by placing a thumb on the scale in favor of vested retiree benefits in all collective bargaining agreements.' Instead, as in traditional contract interpretation, ascertaining the intention of the parties should be paramount." [M&G Polymers USA, LLC v. Tackett, No. 13-1010 (U.S. Jan. 26, 2015)]