     fatalError()
   }
 
-  // FIXME(SR-13096)
+  // FIXME: https://github.com/apple/swift/issues/55542
   // @derivative(of: subscript.set)
   // public func vjpSubscriptSetter(_ x: Float, _ newValue: Float) -> (
   //   value: (), pullback: (inout TangentVector) -> (Float, Float)

  }
}

// SR-13866: Dispatch thunks and method descriptor mangling.
public protocol P: Differentiable {
  @differentiable(reverse, wrt: self)
  @differentiable(reverse, wrt: (self, x))

    @differentiable(reverse)
    get { x }

    // FIXME: https://github.com/apple/swift/issues/55542
    // @differentiable(reverse)
    // set { stored = newValue }
  }
