(motive : Option (Lean.TSyntax `Lean.Parser.Command.docComment) → Sort u_1) →
  (doc : Option (Lean.TSyntax `Lean.Parser.Command.docComment)) →
    ((doc : Lean.TSyntax `Lean.Parser.Command.docComment) → motive (some doc)) →
      ((x : Option (Lean.TSyntax `Lean.Parser.Command.docComment)) → motive x) → motive doc