Assertion failed: (!baseName.isSpecial() && "Can't retrieve the identifier of a special base name"), function getBaseIdentifier, file /Users/danielzheng/swift-build/swift/include/swift/AST/Identifier.h, line 469

extension SIMD2 {
  @differentiable(
    where Scalar : EuclideanDifferentiable & BinaryFloatingPoint,
          Scalar.TangentVector : BinaryFloatingPoint)
  public subscript(index index: Int) -> Scalar {
    @_transparent get { fatalError() }
    @_transparent set { fatalError() }
  }
}
extension SIMD2
  where Scalar : EuclideanDifferentiable & BinaryFloatingPoint,
        Scalar.TangentVector : BinaryFloatingPoint {
  @usableFromInline
  @derivative(of: subscript(index:))
  internal func _vjpSubscript(index: Int)
  -> (value: Scalar, pullback: (Scalar.TangentVector) -> TangentVector) {
    return (self[index], { v in
      var zeros = Self.zero
      zeros[index] = Scalar(v)
      return zeros
    })
  }
}