Goal:
    A : Type  B : Type  R : nat → A → B → Type  n : nat
  ============================
   (All2i_nil = All2i_nil)


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

Goals:

DEBUG:Going to execute:
constructor

Goals:

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