{motive : Lean.Elab.Term.SyntheticMVarDecl → Sort u} →
  ((stx : Lean.Syntax) → (kind : Lean.Elab.Term.SyntheticMVarKind) → motive { stx := stx, kind := kind }) →
    (t : Lean.Elab.Term.SyntheticMVarDecl) → motive t