Goal:
  
  A : Type
  B : Type
  P : A → B → Type
  Q : A → B → Type
  x : A
  y : B
  l : list A
  l' : list B
  q : Q x y
  H : All2 Q l l'
  ============================
   ({| pr1 := []; pr2 := [] |} = {| pr1 := x :: l; pr2 := y :: l' |}
    → let H := CoreTactics.block in
      let H0 := CoreTactics.block in All2 (Trel_conj P Q) [] [])


DEBUG:Going to execute:
simplify * || simplify ?