Goal:
  
  A : Type
  B : Type
  C : Type
  f : A → B → C
  l0' : list A
  l1 : list B
  l1' : list B
  ============================
   (0 = #|l1| → #|l0'| = #|l1'| → map2 f l0' (l1 ++ l1') = map2 f l0' l1')


DEBUG:Going to execute:
<coq-core.plugins.ssreflect::ssrtclintros@0> arg