{motive : Lean.Doc.DocHighlight → Sort u} →
  (t : Lean.Doc.DocHighlight) →
    t.ctorIdx = 1 →
      ((userName : Lean.Name) →
          (fvarId : Lean.FVarId) → (type : Std.Format) → motive (Lean.Doc.DocHighlight.var userName fvarId type)) →
        motive t