(motive :
    MProd Lean.FVarIdSet (MProd (Array Lean.Meta.ExtractLets.LocalDecl') (Array Lean.Meta.ExtractLets.LocalDecl')) →
      Sort u_1) →
  (r : MProd Lean.FVarIdSet (MProd (Array Lean.Meta.ExtractLets.LocalDecl') (Array Lean.Meta.ExtractLets.LocalDecl'))) →
    ((fvarSet : Lean.FVarIdSet) →
        (toFlush toSave : Array Lean.Meta.ExtractLets.LocalDecl') → motive ⟨fvarSet, toFlush, toSave⟩) →
      motive r