Add constraint to ref

Author: lilinus

src/libraries/System.Numerics.Tensors/ref/System.Numerics.Tensors.netcore.cs

@@ -487,7 +487,7 @@ public static void ResizeTo<T>(scoped in System.Numerics.Tensors.Tensor<T> tenso
         public static ref readonly System.Numerics.Tensors.TensorSpan<T> StackAlongDimension<T>(scoped System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors, in System.Numerics.Tensors.TensorSpan<T> destination, int dimension) { throw null; }
         public static System.Numerics.Tensors.Tensor<T> Stack<T>(params scoped System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors) { throw null; }
         public static ref readonly System.Numerics.Tensors.TensorSpan<T> Stack<T>(scoped in System.ReadOnlySpan<System.Numerics.Tensors.Tensor<T>> tensors, in System.Numerics.Tensors.TensorSpan<T> destination) { throw null; }
-        public static T StdDev<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x) where T : System.Numerics.IFloatingPoint<T>, System.Numerics.IPowerFunctions<T>, System.Numerics.IAdditionOperators<T, T, T>, System.Numerics.IAdditiveIdentity<T, T> { throw null; }
+        public static T StdDev<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x) where T : System.Numerics.IFloatingPoint<T>, System.Numerics.IPowerFunctions<T>, System.Numerics.IAdditionOperators<T, T, T>, System.Numerics.IAdditiveIdentity<T, T>, System.Numerics.IRootFunctions<T> { throw null; }
         public static System.Numerics.Tensors.Tensor<T> Subtract<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, in System.Numerics.Tensors.ReadOnlyTensorSpan<T> y) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }
         public static ref readonly System.Numerics.Tensors.TensorSpan<T> Subtract<T>(scoped in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, scoped in System.Numerics.Tensors.ReadOnlyTensorSpan<T> y, in System.Numerics.Tensors.TensorSpan<T> destination) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }
         public static System.Numerics.Tensors.Tensor<T> Subtract<T>(in System.Numerics.Tensors.ReadOnlyTensorSpan<T> x, T y) where T : System.Numerics.ISubtractionOperators<T, T, T> { throw null; }