{motive : FBinopElab.Tree✝ → Sort u} →
  (t : FBinopElab.Tree✝¹) →
    FBinopElab.Tree.ctorIdx✝ t = 2 →
      ((macroName : Lean.Name) →
          (stx stx' : Lean.Syntax) →
            (nested : FBinopElab.Tree✝²) → motive (FBinopElab.Tree.macroExpansion✝ macroName stx stx' nested)) →
        motive t