Goal:
    x : byte  y : byte  Hcomp : Some x = Some y
  ============================
   (let H := CoreTactics.block in let H0 := CoreTactics.block in x = y)


DEBUG:Going to execute:
CoreTactics.on_last_hyp ltac:(fun H' => revert H')
DEBUG LTAC Evaluated term: (let H := CoreTactics.block in
                            let H0 := CoreTactics.block in x = y)