Goal:
    A : Type  l : list A  i : nat  Hi : i < #|l|
  ============================
   (nth_error (List.rev (List.rev l)) (#|l| - S i) = nth_error l (#|l| - S i))


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrrewrite@0> $1 $2