Goal:
  
  A : Type
  B : Type
  R : A → B → Type
  R' : ∀ (a : A) (b : B), R a b → Type
  ============================
   (All2_dep_nil = All2_dep_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>