Goal:
  
  A : Type
  B : Type
  f : A → B
  g : A → B
  a : A
  l : list A
  H : ∀ x : A, f x = g x
  IHl : map f l = map g l
  ============================
   (g a :: map f l = g a :: map g l)


DEBUG:Going to execute:
<coq-core.plugins.cc::cc@0> $1
DEBUG LTAC Evaluated term: H
DEBUG LTAC Evaluated term: H