Goal:
    A : Type  B : Type  P : B → Type  H : 0 = 0
  ============================
   (All2 (λ (_ : A) (b : B), P b) [] [])


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

Goals:

DEBUG:Going to execute:
eauto

Goals:

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