Goal:
    A : Type  f : nat → A  m : nat  n : nat  t : A
  ============================
   (nth_error (unfold m f) n = Some t → t = f n)


DEBUG:Going to execute:
induction m in n |- *

Goals:
    A : Type  f : nat → A  n : nat  t : A
  ============================
   (nth_error (unfold 0 f) n = Some t → t = f n)

  
  A : Type
  f : nat → A
  m : nat
  n : nat
  t : A
  IHm : ∀ n : nat, nth_error (unfold m f) n = Some t → t = f n
  ============================
   (nth_error (unfold (S m) f) n = Some t → t = f n)


DEBUG:Going to execute:
intros Hn
DEBUG LTAC Evaluated term: m

Goals:
  
  A : Type
  f : nat → A
  n : nat
  t : A
  Hn : nth_error (unfold 0 f) n = Some t
  ============================
   (t = f n)

  
  A : Type
  f : nat → A
  m : nat
  n : nat
  t : A
  IHm : ∀ n : nat, nth_error (unfold m f) n = Some t → t = f n
  Hn : nth_error (unfold (S m) f) n = Some t
  ============================
   (t = f n)


DEBUG:Going to execute:
try lia