lemma proved term proof

`singleton_eq_get_zero'`

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formal statement (Lean)

 263private lemma singleton_eq_get_zero' {α : Type*} (l : List α) (h : l.length = 1) :
 264    ∃ x, l = [x] ∧ x = l.get ⟨0, by omega⟩ := by

Term-mode proof.

 265  match l with
 266  | [] => simp at h
 267  | [x] => exact ⟨x, rfl, rfl⟩
 268  | _ :: _ :: _ => simp at h
 269

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