{motive : Lean.Widget.HighlightedSubexprInfo → Sort u} →
  (t : Lean.Widget.HighlightedSubexprInfo) →
    t.ctorIdx = 0 →
      ((info : Lean.Widget.SubexprInfo) → motive (Lean.Widget.HighlightedSubexprInfo.subexpr info)) → motive t