Goal:
    A : Type  l : list A  n : nat  a : A  Heq : nth_error l n = Some a
  ============================
   (nth_error_Spec l n (Some a))


DEBUG:Going to execute:
<coq-core.plugins.ltac::constructor@0>

Goals:
    A : Type  l : list A  n : nat  a : A  Heq : nth_error l n = Some a
  ============================
   (nth_error l n = Some a)

    A : Type  l : list A  n : nat  a : A  Heq : nth_error l n = Some a
  ============================
   (n < #|l|)


DEBUG:Going to execute:
auto

Goals:
    A : Type  l : list A  n : nat  a : A  Heq : nth_error l n = Some a
  ============================
   (nth_error l n = Some a)

    A : Type  l : list A  n : nat  a : A  Heq : nth_error l n = Some a
  ============================
   (n < #|l|)


DEBUG:Going to execute:
<coq-core.plugins.ltac::auto@0> $1 $2 $3