Module: Mathlib.Data.WSeq.Basic

Goal state before:
pp: α : Type u
l : List α
s : WSeq α
s1 s2 : Computation (List α)
h :
  ∃ l' s,
    s1 =
        Computation.corec
          (fun x ↦
            match x with
            | (l, s) =>
              match Seq.destruct s with
              | none => Sum.inl l.reverse
              | some (none, s') => Sum.inr (l, s')
              | some (some a, s') => Sum.inr (a :: l, s'))
          (l' ++ l, s) ∧
      s2 =
        Computation.map (fun x ↦ l.reverse ++ x)
          (Computation.corec
            (fun x ↦
              match x with
              | (l, s) =>
                match Seq.destruct s with
                | none => Sum.inl l.reverse
                | some (none, s') => Sum.inr (l, s')
                | some (some a, s') => Sum.inr (a :: l, s'))
            (l', s))
⊢ BisimO
    (fun c1 c2 ↦
      ∃ l' s,
        c1 =
            Computation.corec
              (fun x ↦
                match x with
                | (l, s) =>
                  match Seq.destruct s with
                  | none => Sum.inl l.reverse
                  | some (none, s') => Sum.inr (l, s')
                  | some (some a, s') => Sum.inr (a :: l, s'))
              (l' ++ l, s) ∧
          c2 =
            Computation.map (fun x ↦ l.reverse ++ x)
              (Computation.corec
                (fun x ↦
                  match x with
                  | (l, s) =>
                    match Seq.destruct s with
                    | none => Sum.inl l.reverse
                    | some (none, s') => Sum.inr (l, s')
                    | some (some a, s') => Sum.inr (a :: l, s'))
                (l', s)))
    s1.destruct s2.destruct

Tactic:
rcases h with ⟨l', s, h⟩

Goal state after:
α : Type u
l : List α
s✝ : WSeq α
s1 s2 : Computation (List α)
l' : List α
s : WSeq α
h :
  s1 =
      Computation.corec
        (fun x ↦
          match x with
          | (l, s) =>
            match Seq.destruct s with
            | none => Sum.inl l.reverse
            | some (none, s') => Sum.inr (l, s')
            | some (some a, s') => Sum.inr (a :: l, s'))
        (l' ++ l, s) ∧
    s2 =
      Computation.map (fun x ↦ l.reverse ++ x)
        (Computation.corec
          (fun x ↦
            match x with
            | (l, s) =>
              match Seq.destruct s with
              | none => Sum.inl l.reverse
              | some (none, s') => Sum.inr (l, s')
              | some (some a, s') => Sum.inr (a :: l, s'))
          (l', s))
⊢ BisimO
    (fun c1 c2 ↦
      ∃ l' s,
        c1 =
            Computation.corec
              (fun x ↦
                match x with
                | (l, s) =>
                  match Seq.destruct s with
                  | none => Sum.inl l.reverse
                  | some (none, s') => Sum.inr (l, s')
                  | some (some a, s') => Sum.inr (a :: l, s'))
              (l' ++ l, s) ∧
          c2 =
            Computation.map (fun x ↦ l.reverse ++ x)
              (Computation.corec
                (fun x ↦
                  match x with
                  | (l, s) =>
                    match Seq.destruct s with
                    | none => Sum.inl l.reverse
                    | some (none, s') => Sum.inr (l, s')
                    | some (some a, s') => Sum.inr (a :: l, s'))
                (l', s)))
    s1.destruct s2.destruct