Goal:
  
  A : Type
  B : Type
  C : Type
  R : nat → A → C → Type
  g : A → B → C
  x : A
  xs : list A
  ih : ∀ (l' : list B) (k : nat),
         All2i (λ (i : nat) (x : A) (y : B), R i x (g x y)) k xs l'
         → All2i R k xs (map2 g xs l')
  k : nat
  z1' : nat
  x0 : A
  y : B
  l : list A
  r : list B
  r0 : R z1' x0 (g x0 y)
  z : All2i (λ (i : nat) (x : A) (y : B), R i x (g x y)) (S z1') l r
  ============================
   ({| pr1 := k; pr2 := {| pr1 := x :: xs; pr2 := [] |} |} =
    {| pr1 := z1'; pr2 := {| pr1 := x0 :: l; pr2 := y :: r |} |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All2i R k (x :: xs) [])


DEBUG:Going to execute:
<coq-equations.plugin::simplify@0> $1

Goals:

DEBUG:Going to execute:
cbv beta

Goals:

DEBUG:Going to execute:
DepElim.simplify_IH_hyps

Goals:

DEBUG:Going to execute:
repeat
            match goal with
            | hyp:context [ CoreTactics.block ]
              |- _ =>
                  cbn beta in hyp; eqns_specialize_eqs_block hyp;
                   cbn[eq_rect_r eq_rect] in hyp
            end

Goals:

DEBUG:Going to execute:
DepElim.unblock_dep_elim

Goals:

DEBUG:Going to execute:
match goal with
           | |- let _ := CoreTactics.block in ?T =>
                 match T with
                 | context [ CoreTactics.block ] =>
                     change T; CoreTactics.intros_until_block
                 end
           | _ => CoreTactics.unblock_goal
           end

Goals:

DEBUG:Going to execute:
CoreTactics.unblock_goal

Goals:

DEBUG:Going to execute:
unfold CoreTactics.block in *; cbv zeta

Goals:

DEBUG:Going to execute:
unfold CoreTactics.block in *

Goals:

DEBUG:Going to execute:
cbv zeta