Goal:
  
  A : Type
  B : Type
  f : A → B
  l : list A
  g : ∀ x : A, In x l → B
  Heqg : g = λ (x : A) (_ : In x l), f x
  ============================
   (let H := CoreTactics.block in map_In l g = map f l)


DEBUG:Going to execute:
<coq-equations.plugin::uncurry_call@0> $1 $2 $3 $4
DEBUG LTAC Evaluated term: @map_In
DEBUG LTAC Evaluated term: (map_In l g)