Habeas - case/controversy, standing.
A Federal habeas petition presents a valid case or controversy with a valid means of redress when the collateral proceeding seeks to challenge one of two concurrent life sentences, where the second conviction is also subject to challenge, as the reversal of the conviction might affect the second collateral challenge.
https://www.ca10.uscourts.gov/opinions/14/14-1497.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.