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- 2 focused subgoals (unfocused: 0-0-1)
- , subgoal 1 (ID 921)
- A : Type
- B : Type
- f : A -> B
- x' : A
- l' : list A
- y : B
- IHl' : In y (map f l') -> exists x : A, f x = y /\ In x l'
- H2 : exists x : A, f x = y /\ In x l'
- ============================
- f x' = y
- subgoal 2 (ID 919) is:
- In x' (x' :: l')
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