{motive : Lean.Server.Test.Runner.Client.HighlightedSubexprInfo → Sort u} →
  (ctorIdx : ℕ) →
    (t : Lean.Server.Test.Runner.Client.HighlightedSubexprInfo) →
      ctorIdx = t.ctorIdx → Lean.Server.Test.Runner.Client.HighlightedSubexprInfo.ctorElimType ctorIdx → motive t