diff --git a/src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.cs b/src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.cs
index 505688bcca807d..9f397c01ae1e13 100644
--- a/src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.cs
+++ b/src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.cs
@@ -207,7 +207,7 @@ public static partial class ImmutableArray
         public static System.Collections.Immutable.ImmutableArray<T> Create<T>(T item1, T item2, T item3, T item4) { throw null; }
         public static System.Collections.Immutable.ImmutableArray<T> Create<T>(params T[]? items) { throw null; }
         public static System.Collections.Immutable.ImmutableArray<T> Create<T>(T[] items, int start, int length) { throw null; }
-        public static System.Collections.Immutable.ImmutableArray<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableArray<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableArray<T> Create<T>(System.Span<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableArray<TSource> ToImmutableArray<TSource>(this System.Collections.Generic.IEnumerable<TSource> items) { throw null; }
         public static System.Collections.Immutable.ImmutableArray<TSource> ToImmutableArray<TSource>(this System.Collections.Immutable.ImmutableArray<TSource>.Builder builder) { throw null; }
@@ -244,7 +244,7 @@ public static partial class ImmutableArray
         public System.Collections.Immutable.ImmutableArray<T> AddRange<TDerived>(TDerived[] items) where TDerived : T { throw null; }
         public System.Collections.Immutable.ImmutableArray<T> AddRange(ImmutableArray<T> items, int length) { throw null; }
         public System.Collections.Immutable.ImmutableArray<T> AddRange<TDerived>(ImmutableArray<TDerived> items) where TDerived : T { throw null; }
-        public System.Collections.Immutable.ImmutableArray<T> AddRange(params System.ReadOnlySpan<T> items) { throw null; }
+        public System.Collections.Immutable.ImmutableArray<T> AddRange(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public System.Collections.Immutable.ImmutableArray<T> AddRange(params T[] items) { throw null; }
         public System.ReadOnlyMemory<T> AsMemory() { throw null; }
         public System.ReadOnlySpan<T> AsSpan() { throw null; }
@@ -284,7 +284,7 @@ public void CopyTo(System.Span<T> destination) { }
         public System.Collections.Immutable.ImmutableArray<T> InsertRange(int index, System.Collections.Generic.IEnumerable<T> items) { throw null; }
         public System.Collections.Immutable.ImmutableArray<T> InsertRange(int index, System.Collections.Immutable.ImmutableArray<T> items) { throw null; }
         public System.Collections.Immutable.ImmutableArray<T> InsertRange(int index, T[] items) { throw null; }
-        public System.Collections.Immutable.ImmutableArray<T> InsertRange(int index, params System.ReadOnlySpan<T> items) { throw null; }
+        public System.Collections.Immutable.ImmutableArray<T> InsertRange(int index, /*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public ref readonly T ItemRef(int index) { throw null; }
         public int LastIndexOf(T item) { throw null; }
         public int LastIndexOf(T item, int startIndex) { throw null; }
@@ -362,8 +362,8 @@ public void AddRange(T[] items, int length) { }
             public void AddRange<TDerived>(System.Collections.Immutable.ImmutableArray<TDerived> items) where TDerived : T { }
             public void AddRange<TDerived>(System.Collections.Immutable.ImmutableArray<TDerived>.Builder items) where TDerived : T { }
             public void AddRange<TDerived>(TDerived[] items) where TDerived : T { }
-            public void AddRange(params System.ReadOnlySpan<T> items) { }
-            public void AddRange<TDerived>(params System.ReadOnlySpan<TDerived> items) where TDerived : T { }
+            public void AddRange(/*params*/ System.ReadOnlySpan<T> items) { }
+            public void AddRange<TDerived>(/*params*/ System.ReadOnlySpan<TDerived> items) where TDerived : T { }
             public void Clear() { }
             public bool Contains(T item) { throw null; }
             public void CopyTo(T[] array, int index) { }
@@ -562,10 +562,10 @@ public static partial class ImmutableHashSet
         public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(System.Collections.Generic.IEqualityComparer<T>? equalityComparer) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(System.Collections.Generic.IEqualityComparer<T>? equalityComparer, T item) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(System.Collections.Generic.IEqualityComparer<T>? equalityComparer, params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(System.Collections.Generic.IEqualityComparer<T>? equalityComparer, params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(System.Collections.Generic.IEqualityComparer<T>? equalityComparer, /*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(T item) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableHashSet<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<TSource> ToImmutableHashSet<TSource>(this System.Collections.Generic.IEnumerable<TSource> source) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<TSource> ToImmutableHashSet<TSource>(this System.Collections.Generic.IEnumerable<TSource> source, System.Collections.Generic.IEqualityComparer<TSource>? equalityComparer) { throw null; }
         public static System.Collections.Immutable.ImmutableHashSet<TSource> ToImmutableHashSet<TSource>(this System.Collections.Immutable.ImmutableHashSet<TSource>.Builder builder) { throw null; }
@@ -691,7 +691,7 @@ public static partial class ImmutableList
         public static System.Collections.Immutable.ImmutableList<T> Create<T>() { throw null; }
         public static System.Collections.Immutable.ImmutableList<T> Create<T>(T item) { throw null; }
         public static System.Collections.Immutable.ImmutableList<T> Create<T>(params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableList<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableList<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static int IndexOf<T>(this System.Collections.Immutable.IImmutableList<T> list, T item) { throw null; }
         public static int IndexOf<T>(this System.Collections.Immutable.IImmutableList<T> list, T item, System.Collections.Generic.IEqualityComparer<T>? equalityComparer) { throw null; }
         public static int IndexOf<T>(this System.Collections.Immutable.IImmutableList<T> list, T item, int startIndex) { throw null; }
@@ -887,7 +887,7 @@ public static partial class ImmutableQueue
         public static System.Collections.Immutable.ImmutableQueue<T> Create<T>() { throw null; }
         public static System.Collections.Immutable.ImmutableQueue<T> Create<T>(T item) { throw null; }
         public static System.Collections.Immutable.ImmutableQueue<T> Create<T>(params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableQueue<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableQueue<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.IImmutableQueue<T> Dequeue<T>(this System.Collections.Immutable.IImmutableQueue<T> queue, out T value) { throw null; }
     }
     [System.Runtime.CompilerServices.CollectionBuilderAttribute(typeof(System.Collections.Immutable.ImmutableQueue), "Create")]
@@ -1063,10 +1063,10 @@ public static partial class ImmutableSortedSet
         public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(System.Collections.Generic.IComparer<T>? comparer) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(System.Collections.Generic.IComparer<T>? comparer, T item) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(System.Collections.Generic.IComparer<T>? comparer, params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(System.Collections.Generic.IComparer<T>? comparer, params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(System.Collections.Generic.IComparer<T>? comparer, /*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(T item) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableSortedSet<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<TSource> ToImmutableSortedSet<TSource>(this System.Collections.Generic.IEnumerable<TSource> source) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<TSource> ToImmutableSortedSet<TSource>(this System.Collections.Generic.IEnumerable<TSource> source, System.Collections.Generic.IComparer<TSource>? comparer) { throw null; }
         public static System.Collections.Immutable.ImmutableSortedSet<TSource> ToImmutableSortedSet<TSource>(this System.Collections.Immutable.ImmutableSortedSet<TSource>.Builder builder) { throw null; }
@@ -1198,7 +1198,7 @@ public static partial class ImmutableStack
         public static System.Collections.Immutable.ImmutableStack<T> Create<T>() { throw null; }
         public static System.Collections.Immutable.ImmutableStack<T> Create<T>(T item) { throw null; }
         public static System.Collections.Immutable.ImmutableStack<T> Create<T>(params T[] items) { throw null; }
-        public static System.Collections.Immutable.ImmutableStack<T> Create<T>(params System.ReadOnlySpan<T> items) { throw null; }
+        public static System.Collections.Immutable.ImmutableStack<T> Create<T>(/*params*/ System.ReadOnlySpan<T> items) { throw null; }
         public static System.Collections.Immutable.IImmutableStack<T> Pop<T>(this System.Collections.Immutable.IImmutableStack<T> stack, out T value) { throw null; }
     }
     [System.Runtime.CompilerServices.CollectionBuilderAttribute(typeof(System.Collections.Immutable.ImmutableStack), "Create")]
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray.cs
index 8f244bc8305bd5..aafe4316eb7503 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray.cs
@@ -87,7 +87,7 @@ public static ImmutableArray<T> Create<T>(T item1, T item2, T item3, T item4)
         /// <typeparam name="T">The type of element stored in the array.</typeparam>
         /// <param name="items">The elements to store in the array.</param>
         /// <returns>An immutable array containing the specified items.</returns>
-        public static ImmutableArray<T> Create<T>(params ReadOnlySpan<T> items)
+        public static ImmutableArray<T> Create<T>(/*params*/ ReadOnlySpan<T> items)
         {
             if (items.IsEmpty)
             {
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs
index b43bc61d905d0c..060492a40bd06e 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs
@@ -430,7 +430,7 @@ public void AddRange(ImmutableArray<T> items, int length)
             /// Adds the specified items to the end of the array.
             /// </summary>
             /// <param name="items">The items to add at the end of the array.</param>
-            public void AddRange(params ReadOnlySpan<T> items)
+            public void AddRange(/*params*/ ReadOnlySpan<T> items)
             {
                 int offset = this.Count;
                 this.Count += items.Length;
@@ -443,7 +443,7 @@ public void AddRange(params ReadOnlySpan<T> items)
             /// </summary>
             /// <typeparam name="TDerived">The type that derives from the type of item already in the array.</typeparam>
             /// <param name="items">The items to add at the end of the array.</param>
-            public void AddRange<TDerived>(params ReadOnlySpan<TDerived> items) where TDerived : T
+            public void AddRange<TDerived>(/*params*/ ReadOnlySpan<TDerived> items) where TDerived : T
             {
                 int offset = this.Count;
                 this.Count += items.Length;
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.cs
index 5d146329b1850f..04e05477e0ff7c 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.cs
@@ -880,7 +880,7 @@ public IEnumerable<TResult> OfType<TResult>()
         /// </summary>
         /// <param name="items">The values to add.</param>
         /// <returns>A new list with the elements added.</returns>
-        public ImmutableArray<T> AddRange(params ReadOnlySpan<T> items)
+        public ImmutableArray<T> AddRange(/*params*/ ReadOnlySpan<T> items)
         {
             ImmutableArray<T> self = this;
             return self.InsertRange(self.Length, items);
@@ -949,7 +949,7 @@ public ImmutableArray<T> InsertRange(int index, T[] items)
         /// <param name="index">The index at which to insert the value.</param>
         /// <param name="items">The elements to insert.</param>
         /// <returns>The new immutable collection.</returns>
-        public ImmutableArray<T> InsertRange(int index, params ReadOnlySpan<T> items)
+        public ImmutableArray<T> InsertRange(int index, /*params*/ ReadOnlySpan<T> items)
         {
             ImmutableArray<T> self = this;
             self.ThrowNullRefIfNotInitialized();
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet.cs
index 8cb871e5e01d0c..13742785d7d81e 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableHashSet.cs
@@ -98,7 +98,7 @@ public static ImmutableHashSet<T> Create<T>(params T[] items)
         /// <typeparam name="T">The type of items stored by the collection.</typeparam>
         /// <param name="items">The items to prepopulate.</param>
         /// <returns>The new immutable collection.</returns>
-        public static ImmutableHashSet<T> Create<T>(params ReadOnlySpan<T> items)
+        public static ImmutableHashSet<T> Create<T>(/*params*/ ReadOnlySpan<T> items)
         {
             return ImmutableHashSet<T>.Empty.Union(items);
         }
@@ -124,7 +124,7 @@ public static ImmutableHashSet<T> Create<T>(IEqualityComparer<T>? equalityCompar
         /// <param name="equalityComparer">The equality comparer.</param>
         /// <param name="items">The items to prepopulate.</param>
         /// <returns>The new immutable collection.</returns>
-        public static ImmutableHashSet<T> Create<T>(IEqualityComparer<T>? equalityComparer, params ReadOnlySpan<T> items)
+        public static ImmutableHashSet<T> Create<T>(IEqualityComparer<T>? equalityComparer, /*params*/ ReadOnlySpan<T> items)
         {
             return ImmutableHashSet<T>.Empty.WithComparer(equalityComparer).Union(items);
         }
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableList.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableList.cs
index 43c0b23bc954cf..977686b880cc8c 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableList.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableList.cs
@@ -52,7 +52,7 @@ public static ImmutableList<T> Create<T>(params T[] items)
         /// <typeparam name="T">The type of items stored by the collection.</typeparam>
         /// <param name="items">A span that contains the items to prepopulate the list with.</param>
         /// <returns>A new immutable list that contains the specified items.</returns>
-        public static ImmutableList<T> Create<T>(params ReadOnlySpan<T> items) => ImmutableList<T>.Empty.AddRange(items);
+        public static ImmutableList<T> Create<T>(/*params*/ ReadOnlySpan<T> items) => ImmutableList<T>.Empty.AddRange(items);
 
         /// <summary>
         /// Creates a new immutable list builder.
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableQueue.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableQueue.cs
index 051d79aa6e6446..d2f5d142bbf869 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableQueue.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableQueue.cs
@@ -83,7 +83,7 @@ public static ImmutableQueue<T> Create<T>(params T[] items)
         /// <typeparam name="T">The type of items in the immutable queue.</typeparam>
         /// <param name="items">A span that contains the items to prepopulate the queue with.</param>
         /// <returns>A new immutable queue that contains the specified items.</returns>
-        public static ImmutableQueue<T> Create<T>(params ReadOnlySpan<T> items)
+        public static ImmutableQueue<T> Create<T>(/*params*/ ReadOnlySpan<T> items)
         {
             if (items.IsEmpty)
             {
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableSortedSet.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableSortedSet.cs
index c2eb3641807015..ae5493ff083213 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableSortedSet.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableSortedSet.cs
@@ -97,7 +97,7 @@ public static ImmutableSortedSet<T> Create<T>(params T[] items)
         /// <typeparam name="T">The type of items in the immutable set.</typeparam>
         /// <param name="items">A span that contains the items to prepopulate the set with.</param>
         /// <returns>A new immutable set that contains the specified items.</returns>
-        public static ImmutableSortedSet<T> Create<T>(params ReadOnlySpan<T> items)
+        public static ImmutableSortedSet<T> Create<T>(/*params*/ ReadOnlySpan<T> items)
         {
             return ImmutableSortedSet<T>.Empty.Union(items);
         }
@@ -123,7 +123,7 @@ public static ImmutableSortedSet<T> Create<T>(IComparer<T>? comparer, params T[]
         /// <param name="comparer">The comparer.</param>
         /// <param name="items">The items to prepopulate.</param>
         /// <returns>The new immutable collection.</returns>
-        public static ImmutableSortedSet<T> Create<T>(IComparer<T>? comparer, params ReadOnlySpan<T> items)
+        public static ImmutableSortedSet<T> Create<T>(IComparer<T>? comparer, /*params*/ ReadOnlySpan<T> items)
         {
             return ImmutableSortedSet<T>.Empty.WithComparer(comparer).Union(items);
         }
diff --git a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableStack.cs b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableStack.cs
index 12480554339e9c..f964f55c79908c 100644
--- a/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableStack.cs
+++ b/src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableStack.cs
@@ -70,7 +70,7 @@ public static ImmutableStack<T> Create<T>(params T[] items)
         /// <typeparam name="T">The type of items in the immutable stack.</typeparam>
         /// <param name="items">A span that contains the items to prepopulate the stack with.</param>
         /// <returns>A new immutable stack that contains the specified items.</returns>
-        public static ImmutableStack<T> Create<T>(params ReadOnlySpan<T> items)
+        public static ImmutableStack<T> Create<T>(/*params*/ ReadOnlySpan<T> items)
         {
             ImmutableStack<T> stack = ImmutableStack<T>.Empty;
             foreach (T item in items)
diff --git a/src/libraries/System.Collections/ref/System.Collections.cs b/src/libraries/System.Collections/ref/System.Collections.cs
index 6d8c4f6f27389c..c5e3648a54d523 100644
--- a/src/libraries/System.Collections/ref/System.Collections.cs
+++ b/src/libraries/System.Collections/ref/System.Collections.cs
@@ -416,11 +416,11 @@ namespace System.Collections.Generic
 {
     public static partial class CollectionExtensions
     {
-        public static void AddRange<T>(this System.Collections.Generic.List<T> list, params System.ReadOnlySpan<T> source) { }
+        public static void AddRange<T>(this System.Collections.Generic.List<T> list, /*params*/ System.ReadOnlySpan<T> source) { }
         public static void CopyTo<T>(this System.Collections.Generic.List<T> list, System.Span<T> destination) { }
         public static TValue? GetValueOrDefault<TKey, TValue>(this System.Collections.Generic.IReadOnlyDictionary<TKey, TValue> dictionary, TKey key) { throw null; }
         public static TValue GetValueOrDefault<TKey, TValue>(this System.Collections.Generic.IReadOnlyDictionary<TKey, TValue> dictionary, TKey key, TValue defaultValue) { throw null; }
-        public static void InsertRange<T>(this System.Collections.Generic.List<T> list, int index, params System.ReadOnlySpan<T> source) { }
+        public static void InsertRange<T>(this System.Collections.Generic.List<T> list, int index, /*params*/ System.ReadOnlySpan<T> source) { }
         public static bool Remove<TKey, TValue>(this System.Collections.Generic.IDictionary<TKey, TValue> dictionary, TKey key, [System.Diagnostics.CodeAnalysis.MaybeNullWhenAttribute(false)] out TValue value) { throw null; }
         public static bool TryAdd<TKey, TValue>(this System.Collections.Generic.IDictionary<TKey, TValue> dictionary, TKey key, TValue value) { throw null; }
         public static System.Collections.ObjectModel.ReadOnlyCollection<T> AsReadOnly<T>(this IList<T> list) { throw null; }
diff --git a/src/libraries/System.Console/ref/System.Console.cs b/src/libraries/System.Console/ref/System.Console.cs
index 297f94aac0ec06..c8d4bb61b3c575 100644
--- a/src/libraries/System.Console/ref/System.Console.cs
+++ b/src/libraries/System.Console/ref/System.Console.cs
@@ -175,7 +175,7 @@ public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute(
         public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[]? arg) { }
-        public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public static void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         [System.CLSCompliantAttribute(false)]
         public static void Write(uint value) { }
         [System.CLSCompliantAttribute(false)]
@@ -196,7 +196,7 @@ public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttrib
         public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[]? arg) { }
-        public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public static void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         [System.CLSCompliantAttribute(false)]
         public static void WriteLine(uint value) { }
         [System.CLSCompliantAttribute(false)]
diff --git a/src/libraries/System.Console/src/System/Console.cs b/src/libraries/System.Console/src/System/Console.cs
index d2db8f831d448b..5e0e387b8299fb 100644
--- a/src/libraries/System.Console/src/System/Console.cs
+++ b/src/libraries/System.Console/src/System/Console.cs
@@ -871,7 +871,7 @@ public static void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">A span of objects to write using format.</param>
         [MethodImplAttribute(MethodImplOptions.NoInlining)]
-        public static void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public static void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             Out.WriteLine(format, arg);
         }
@@ -909,7 +909,7 @@ public static void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] s
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">A span of objects to write using format.</param>
         [MethodImplAttribute(MethodImplOptions.NoInlining)]
-        public static void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public static void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             Out.Write(format, arg);
         }
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs
index a6b737d5615bab..342170fad78e85 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs
@@ -297,7 +297,7 @@ public abstract class DistributedContextPropagator
     [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
     public struct TagList : System.Collections.Generic.IList<System.Collections.Generic.KeyValuePair<string, object?>>, System.Collections.Generic.IReadOnlyList<System.Collections.Generic.KeyValuePair<string, object?>>
     {
-        public TagList(params System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tagList) : this() { throw null; }
+        public TagList(/*params*/ System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tagList) : this() { throw null; }
         public readonly int Count => throw null;
         public readonly bool IsReadOnly => throw null;
         public System.Collections.Generic.KeyValuePair<string, object?> this[int index]
@@ -336,7 +336,7 @@ public sealed class Counter<T> : Instrument<T> where T : struct
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag)  { throw null; }
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2)  { throw null; }
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2, System.Collections.Generic.KeyValuePair<string, object?> tag3)  { throw null; }
-        public void Add(T delta, params System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
+        public void Add(T delta, /*params*/ System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
         public void Add(T delta, params System.Collections.Generic.KeyValuePair<string, object?>[] tags) { throw null; }
         public void Add(T delta, in TagList tagList) { throw null; }
         internal Counter(Meter meter, string name, string? unit, string? description) :
@@ -348,7 +348,7 @@ public sealed class UpDownCounter<T> : Instrument<T> where T : struct
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag)  { throw null; }
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2)  { throw null; }
         public void Add(T delta, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2, System.Collections.Generic.KeyValuePair<string, object?> tag3)  { throw null; }
-        public void Add(T delta, params System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
+        public void Add(T delta, /*params*/ System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
         public void Add(T delta, params System.Collections.Generic.KeyValuePair<string, object?>[] tags) { throw null; }
         public void Add(T delta, in TagList tagList) { throw null; }
         internal UpDownCounter(Meter meter, string name, string? unit, string? description) :
@@ -362,7 +362,7 @@ public sealed class Histogram<T> : Instrument<T> where T : struct
         public void Record(T value, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2) { throw null; }
         public void Record(T value, System.Collections.Generic.KeyValuePair<string, object?> tag1, System.Collections.Generic.KeyValuePair<string, object?> tag2, System.Collections.Generic.KeyValuePair<string, object?> tag3) { throw null; }
         public void Record(T value, in TagList tagList) { throw null; }
-        public void Record(T value, params System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
+        public void Record(T value, /*params*/ System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
         public void Record(T value, params System.Collections.Generic.KeyValuePair<string, object?>[] tags) { throw null; }
     }
     public interface IMeterFactory : System.IDisposable
@@ -398,7 +398,7 @@ public abstract class Instrument<T> : Instrument where T : struct
         public Measurement(T value) { throw null; }
         public Measurement(T value, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string, object?>>? tags) { throw null; }
         public Measurement(T value, params System.Collections.Generic.KeyValuePair<string, object?>[]? tags) { throw null; }
-        public Measurement(T value, params System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
+        public Measurement(T value, /*params*/ System.ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> tags) { throw null; }
         public ReadOnlySpan<System.Collections.Generic.KeyValuePair<string, object?>> Tags { get { throw null; } }
         public T Value { get { throw null; } }
     }
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Counter.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Counter.cs
index 4c503a50ac7208..9f15ff37c70104 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Counter.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Counter.cs
@@ -59,7 +59,7 @@ internal Counter(Meter meter, string name, string? unit, string? description, IE
         /// </summary>
         /// <param name="delta">The increment measurement.</param>
         /// <param name="tags">A span of key-value pair tags associated with the measurement.</param>
-        public void Add(T delta, params ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(delta, tags);
+        public void Add(T delta, /*params*/ ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(delta, tags);
 
         /// <summary>
         /// Record the increment value of the measurement.
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Histogram.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Histogram.cs
index 3863efe704c7c2..91f5f40da6e80e 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Histogram.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Histogram.cs
@@ -59,7 +59,7 @@ internal Histogram(Meter meter, string name, string? unit, string? description,
         /// </summary>
         /// <param name="value">The measurement value.</param>
         /// <param name="tags">A span of key-value pair tags associated with the measurement.</param>
-        public void Record(T value, params ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(value, tags);
+        public void Record(T value, /*params*/ ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(value, tags);
 
         /// <summary>
         /// Record a measurement value.
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Measurement.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Measurement.cs
index 88f26985552277..f678ef66014ff0 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Measurement.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/Measurement.cs
@@ -59,7 +59,7 @@ public Measurement(T value, params KeyValuePair<string, object?>[]? tags)
         /// </summary>
         /// <param name="value">The measurement value.</param>
         /// <param name="tags">The measurement associated tags list.</param>
-        public Measurement(T value, params ReadOnlySpan<KeyValuePair<string, object?>> tags)
+        public Measurement(T value, /*params*/ ReadOnlySpan<KeyValuePair<string, object?>> tags)
         {
             _tags = tags.ToArray();
             Value = value;
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/TagList.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/TagList.cs
index f003241ceb40a3..138da8875aeed6 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/TagList.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/TagList.cs
@@ -43,7 +43,7 @@ public struct TagList : IList<KeyValuePair<string, object?>>, IReadOnlyList<KeyV
         /// Initializes a new instance of the TagList structure using the specified <paramref name="tagList" />.
         /// </summary>
         /// <param name="tagList">A span of tags to initialize the list with.</param>
-        public TagList(params ReadOnlySpan<KeyValuePair<string, object?>> tagList) : this()
+        public TagList(/*params*/ ReadOnlySpan<KeyValuePair<string, object?>> tagList) : this()
         {
             _tagsCount = tagList.Length;
             switch (_tagsCount)
diff --git a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/UpDownCounter.cs b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/UpDownCounter.cs
index dc9a65b91d37c8..4a093865c5511d 100644
--- a/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/UpDownCounter.cs
+++ b/src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/Metrics/UpDownCounter.cs
@@ -58,7 +58,7 @@ internal UpDownCounter(Meter meter, string name, string? unit, string? descripti
         /// </summary>
         /// <param name="delta">The amount to be added which can be positive, negative or zero.</param>
         /// <param name="tags">A span of key-value pair tags associated with the measurement.</param>
-        public void Add(T delta, params ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(delta, tags);
+        public void Add(T delta, /*params*/ ReadOnlySpan<KeyValuePair<string, object?>> tags) => RecordMeasurement(delta, tags);
 
         /// <summary>
         /// Record the delta value of the measurement. The delta can be positive, negative or zero.
diff --git a/src/libraries/System.Memory/ref/System.Memory.cs b/src/libraries/System.Memory/ref/System.Memory.cs
index edacc807a04fc3..c2ed032012c826 100644
--- a/src/libraries/System.Memory/ref/System.Memory.cs
+++ b/src/libraries/System.Memory/ref/System.Memory.cs
@@ -408,7 +408,7 @@ public static void Sort<TKey, TValue, TComparer>(this System.Span<TKey> keys, Sy
         public static bool TryWrite<TArg0, TArg1>(this System.Span<char> destination, System.IFormatProvider? provider, System.Text.CompositeFormat format, out int charsWritten, TArg0 arg0, TArg1 arg1) { throw null; }
         public static bool TryWrite<TArg0, TArg1, TArg2>(this System.Span<char> destination, System.IFormatProvider? provider, System.Text.CompositeFormat format, out int charsWritten, TArg0 arg0, TArg1 arg1, TArg2 arg2) { throw null; }
         public static bool TryWrite(this Span<char> destination, System.IFormatProvider? provider, System.Text.CompositeFormat format, out int charsWritten, params object?[] args) { throw null; }
-        public static bool TryWrite(this Span<char> destination, System.IFormatProvider? provider, System.Text.CompositeFormat format, out int charsWritten, params System.ReadOnlySpan<object?> args) { throw null; }
+        public static bool TryWrite(this Span<char> destination, System.IFormatProvider? provider, System.Text.CompositeFormat format, out int charsWritten, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
         [System.Runtime.CompilerServices.InterpolatedStringHandlerAttribute]
         public ref struct TryWriteInterpolatedStringHandler
diff --git a/src/libraries/System.Private.CoreLib/src/System/CodeDom/Compiler/IndentedTextWriter.cs b/src/libraries/System.Private.CoreLib/src/System/CodeDom/Compiler/IndentedTextWriter.cs
index dc7eca31f0d8f7..43608b97f78ff1 100644
--- a/src/libraries/System.Private.CoreLib/src/System/CodeDom/Compiler/IndentedTextWriter.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/CodeDom/Compiler/IndentedTextWriter.cs
@@ -179,7 +179,7 @@ public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)]
         /// </summary>
         /// <param name="format">The formatting string to use.</param>
         /// <param name="arg">The argument span to output.</param>
-        public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             OutputTabs();
             _writer.Write(format, arg);
@@ -368,7 +368,7 @@ public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeForm
         /// </summary>
         /// <param name="format">The formatting string to use.</param>
         /// <param name="arg">The argument span to output.</param>
-        public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             OutputTabs();
             _writer.WriteLine(format, arg);
diff --git a/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/CollectionExtensions.cs b/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/CollectionExtensions.cs
index cf4256f546d59f..6c7949eed7bf74 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/CollectionExtensions.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/CollectionExtensions.cs
@@ -82,7 +82,7 @@ public static ReadOnlyDictionary<TKey, TValue> AsReadOnly<TKey, TValue>(this IDi
         /// <param name="list">The list to which the elements should be added.</param>
         /// <param name="source">The span whose elements should be added to the end of the <see cref="List{T}"/>.</param>
         /// <exception cref="ArgumentNullException">The <paramref name="list"/> is null.</exception>
-        public static void AddRange<T>(this List<T> list, params ReadOnlySpan<T> source)
+        public static void AddRange<T>(this List<T> list, /*params*/ ReadOnlySpan<T> source)
         {
             if (list is null)
             {
@@ -109,7 +109,7 @@ public static void AddRange<T>(this List<T> list, params ReadOnlySpan<T> source)
         /// <param name="source">The span whose elements should be added to the <see cref="List{T}"/>.</param>
         /// <exception cref="ArgumentNullException">The <paramref name="list"/> is null.</exception>
         /// <exception cref="ArgumentOutOfRangeException"><paramref name="index"/> is less than 0 or greater than <paramref name="list"/>'s <see cref="List{T}.Count"/>.</exception>
-        public static void InsertRange<T>(this List<T> list, int index, params ReadOnlySpan<T> source)
+        public static void InsertRange<T>(this List<T> list, int index, /*params*/ ReadOnlySpan<T> source)
         {
             if (list is null)
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/Delegate.cs b/src/libraries/System.Private.CoreLib/src/System/Delegate.cs
index 9e5a8170ac61cf..cc8a66e341b529 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Delegate.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Delegate.cs
@@ -35,7 +35,7 @@ public abstract partial class Delegate : ICloneable, ISerializable
         /// Returns <see langword="null" /> if <paramref name="delegates"/> is <see langword="null" />,
         /// if <paramref name="delegates"/> contains zero elements, or if every entry in <paramref name="delegates"/> is <see langword="null" />.
         /// </returns>
-        public static Delegate? Combine(params ReadOnlySpan<Delegate?> delegates)
+        public static Delegate? Combine(/*params*/ ReadOnlySpan<Delegate?> delegates)
         {
             Delegate? d = null;
 
diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/Path.cs b/src/libraries/System.Private.CoreLib/src/System/IO/Path.cs
index 7b828df7720dea..e6cc976336bbfd 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/Path.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/Path.cs
@@ -379,7 +379,7 @@ public static string Combine(params string[] paths)
         /// </summary>
         /// <param name="paths">A span of parts of the path.</param>
         /// <returns>The combined paths.</returns>
-        public static string Combine(params ReadOnlySpan<string> paths)
+        public static string Combine(/*params*/ ReadOnlySpan<string> paths)
         {
             int maxSize = 0;
             int firstComponent = 0;
@@ -537,7 +537,7 @@ public static string Join(params string?[] paths)
         /// </summary>
         /// <param name="paths">A span of paths.</param>
         /// <returns>The concatenated path.</returns>
-        public static string Join(params ReadOnlySpan<string?> paths)
+        public static string Join(/*params*/ ReadOnlySpan<string?> paths)
         {
             if (paths.IsEmpty)
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs b/src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs
index 58efa18407c70d..947c803d6d2747 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs
@@ -573,7 +573,7 @@ public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)]
         /// </summary>
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">An object span that contains zero or more objects to format and write.</param>
-        public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             if (GetType() == typeof(StreamWriter))
             {
@@ -641,7 +641,7 @@ public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeForm
         /// </summary>
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">An object span that contains zero or more objects to format and write.</param>
-        public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             if (GetType() == typeof(StreamWriter))
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.CreateBroadcasting.cs b/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.CreateBroadcasting.cs
index 0637cafb27e985..82c9d6edd619d5 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.CreateBroadcasting.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.CreateBroadcasting.cs
@@ -268,7 +268,7 @@ public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)]
                 }
             }
 
-            public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+            public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
             {
                 foreach (TextWriter writer in _writers)
                 {
@@ -436,7 +436,7 @@ public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeForm
                 }
             }
 
-            public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+            public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
             {
                 foreach (TextWriter writer in _writers)
                 {
diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs b/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs
index a6070683047a33..27a73516d4be96 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/TextWriter.cs
@@ -322,7 +322,7 @@ public virtual void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)]
         /// </summary>
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">An object span that contains zero or more objects to format and write.</param>
-        public virtual void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public virtual void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             Write(string.Format(FormatProvider, format, arg));
         }
@@ -529,7 +529,7 @@ public virtual void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeForma
         /// </summary>
         /// <param name="format">A composite format string.</param>
         /// <param name="arg">An object span that contains zero or more objects to format and write.</param>
-        public virtual void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg)
+        public virtual void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg)
         {
             WriteLine(string.Format(FormatProvider, format, arg));
         }
@@ -720,7 +720,7 @@ public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)]
             public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1) { }
             public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1, object? arg2) { }
             public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params object?[] arg) { }
-            public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg) { }
+            public override void Write([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg) { }
             public override Task WriteAsync(char value) => Task.CompletedTask;
             public override Task WriteAsync(string? value) => Task.CompletedTask;
             public override Task WriteAsync(StringBuilder? value, CancellationToken cancellationToken = default) => Task.CompletedTask;
@@ -746,7 +746,7 @@ public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeForm
             public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1) { }
             public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, object? arg0, object? arg1, object? arg2) { }
             public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params object?[] arg) { }
-            public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> arg) { }
+            public override void WriteLine([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> arg) { }
             public override Task WriteLineAsync(char value) => Task.CompletedTask;
             public override Task WriteLineAsync(string? value) => Task.CompletedTask;
             public override Task WriteLineAsync(StringBuilder? value, CancellationToken cancellationToken = default) => Task.CompletedTask;
diff --git a/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs b/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
index f088e3ced535a3..d3c9e28cb0ccda 100644
--- a/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.cs
@@ -4173,7 +4173,7 @@ public static bool TryWrite(this Span<char> destination, IFormatProvider? provid
         /// <returns><see langword="true"/> if the entire interpolated string could be formatted successfully; otherwise, <see langword="false"/>.</returns>
         /// <exception cref="ArgumentNullException"><paramref name="format"/> is null.</exception>
         /// <exception cref="FormatException">The index of a format item is greater than or equal to the number of supplied arguments.</exception>
-        public static bool TryWrite(this Span<char> destination, IFormatProvider? provider, CompositeFormat format, out int charsWritten, params ReadOnlySpan<object?> args)
+        public static bool TryWrite(this Span<char> destination, IFormatProvider? provider, CompositeFormat format, out int charsWritten, /*params*/ ReadOnlySpan<object?> args)
         {
             ArgumentNullException.ThrowIfNull(format);
             format.ValidateNumberOfArgs(args.Length);
diff --git a/src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs b/src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs
index 3d421f35d99a84..596e743ebe215d 100644
--- a/src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/String.Manipulation.cs
@@ -70,7 +70,7 @@ public static string Concat(params object?[] args)
         /// </summary>
         /// <param name="args">A span of objects that contains the elements to concatenate.</param>
         /// <returns>The concatenated string representations of the values of the elements in <paramref name="args"/>.</returns>
-        public static string Concat(params ReadOnlySpan<object?> args)
+        public static string Concat(/*params*/ ReadOnlySpan<object?> args)
         {
             if (args.Length <= 1)
             {
@@ -372,7 +372,7 @@ public static string Concat(params string?[] values)
         /// </summary>
         /// <param name="values">A span of <see cref="string"/> instances.</param>
         /// <returns>The concatenated elements of <paramref name="values"/>.</returns>
-        public static string Concat(params ReadOnlySpan<string?> values)
+        public static string Concat(/*params*/ ReadOnlySpan<string?> values)
         {
             if (values.Length <= 1)
             {
@@ -472,7 +472,7 @@ public static string Format([StringSyntax(StringSyntaxAttribute.CompositeFormat)
         /// <param name="format">A <see href="https://learn.microsoft.com/dotnet/standard/base-types/composite-formatting">composite format string</see>.</param>
         /// <param name="args">An object span that contains zero or more objects to format.</param>
         /// <returns>A copy of <paramref name="format"/> in which the format items have been replaced by the string representation of the corresponding objects in <paramref name="args"/>.</returns>
-        public static string Format([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> args)
+        public static string Format([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> args)
         {
             return FormatHelper(null, format, args);
         }
@@ -514,7 +514,7 @@ public static string Format(IFormatProvider? provider, [StringSyntax(StringSynta
         /// <param name="format">A <see href="https://learn.microsoft.com/dotnet/standard/base-types/composite-formatting">composite format string</see>.</param>
         /// <param name="args">An object span that contains zero or more objects to format.</param>
         /// <returns>A copy of <paramref name="format"/> in which the format items have been replaced by the string representation of the corresponding objects in <paramref name="args"/>.</returns>
-        public static string Format(IFormatProvider? provider, [StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> args)
+        public static string Format(IFormatProvider? provider, [StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> args)
         {
             return FormatHelper(provider, format, args);
         }
@@ -617,7 +617,7 @@ public static string Format(IFormatProvider? provider, CompositeFormat format, p
         /// <returns>The formatted string.</returns>
         /// <exception cref="ArgumentNullException"><paramref name="format"/> is null.</exception>
         /// <exception cref="FormatException">The index of a format item is greater than or equal to the number of supplied arguments.</exception>
-        public static string Format(IFormatProvider? provider, CompositeFormat format, params ReadOnlySpan<object?> args)
+        public static string Format(IFormatProvider? provider, CompositeFormat format, /*params*/ ReadOnlySpan<object?> args)
         {
             ArgumentNullException.ThrowIfNull(format);
             format.ValidateNumberOfArgs(args.Length);
@@ -721,7 +721,7 @@ public static string Join(char separator, params string?[] value)
         /// -or-
         /// <see cref="Empty"/> if <paramref name="value"/> has zero elements.
         /// </returns>
-        public static string Join(char separator, params ReadOnlySpan<string?> value)
+        public static string Join(char separator, /*params*/ ReadOnlySpan<string?> value)
         {
             return JoinCore(new ReadOnlySpan<char>(in separator), value);
         }
@@ -746,7 +746,7 @@ public static string Join(string? separator, params string?[] value)
         /// -or-
         /// <see cref="Empty"/> if <paramref name="value"/> has zero elements.
         /// </returns>
-        public static string Join(string? separator, params ReadOnlySpan<string?> value)
+        public static string Join(string? separator, /*params*/ ReadOnlySpan<string?> value)
         {
             return JoinCore(separator.AsSpan(), value);
         }
@@ -835,7 +835,7 @@ public static string Join(char separator, params object?[] values)
         /// -or-
         /// <see cref="Empty"/> if <paramref name="values"/> has zero elements.
         /// </returns>
-        public static string Join(char separator, params ReadOnlySpan<object?> values) =>
+        public static string Join(char separator, /*params*/ ReadOnlySpan<object?> values) =>
             JoinCore(new ReadOnlySpan<char>(in separator), values);
 
         public static string Join(string? separator, params object?[] values)
@@ -858,7 +858,7 @@ public static string Join(string? separator, params object?[] values)
         /// -or-
         /// <see cref="Empty"/> if <paramref name="values"/> has zero elements.
         /// </returns>
-        public static string Join(string? separator, params ReadOnlySpan<object?> values) =>
+        public static string Join(string? separator, /*params*/ ReadOnlySpan<object?> values) =>
             JoinCore(separator.AsSpan(), values);
 
         private static string JoinCore(ReadOnlySpan<char> separator, ReadOnlySpan<object?> values)
@@ -1660,7 +1660,7 @@ public string[] Split(params char[]? separator)
         /// </summary>
         /// <param name="separator">A span of delimiting characters, or an empty span that contains no delimiters.</param>
         /// <returns>An array whose elements contain the substrings from this instance that are delimited by one or more characters in <paramref name="separator"/>.</returns>
-        public string[] Split(params ReadOnlySpan<char> separator)
+        public string[] Split(/*params*/ ReadOnlySpan<char> separator)
         {
             return SplitInternal(separator, int.MaxValue, StringSplitOptions.None);
         }
@@ -2367,7 +2367,7 @@ public unsafe string Trim(params char[]? trimChars)
         /// If <paramref name="trimChars"/> is empty, white-space characters are removed instead.
         /// If no characters can be trimmed from the current instance, the method returns the current instance unchanged.
         /// </returns>
-        public unsafe string Trim(params ReadOnlySpan<char> trimChars)
+        public unsafe string Trim(/*params*/ ReadOnlySpan<char> trimChars)
         {
             if (trimChars.IsEmpty)
             {
@@ -2408,7 +2408,7 @@ public unsafe string TrimStart(params char[]? trimChars)
         /// If <paramref name="trimChars"/> is empty, white-space characters are removed instead.
         /// If no characters can be trimmed from the current instance, the method returns the current instance unchanged.
         /// </returns>
-        public unsafe string TrimStart(params ReadOnlySpan<char> trimChars)
+        public unsafe string TrimStart(/*params*/ ReadOnlySpan<char> trimChars)
         {
             if (trimChars.IsEmpty)
             {
@@ -2449,7 +2449,7 @@ public unsafe string TrimEnd(params char[]? trimChars)
         /// If <paramref name="trimChars"/> is empty, white-space characters are removed instead.
         /// If no characters can be trimmed from the current instance, the method returns the current instance unchanged.
         /// </returns>
-        public unsafe string TrimEnd(params ReadOnlySpan<char> trimChars)
+        public unsafe string TrimEnd(/*params*/ ReadOnlySpan<char> trimChars)
         {
             if (trimChars.IsEmpty)
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs b/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
index 7a33d7d0ed3a76..e7bee231dbf45d 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs
@@ -1140,7 +1140,7 @@ public StringBuilder AppendJoin(string? separator, params object?[] values)
         /// <param name="separator">The string to use as a separator. <paramref name="separator"/> is included in the joined strings only if <paramref name="values"/> has more than one element.</param>
         /// <param name="values">A span that contains the strings to concatenate and append to the current instance of the string builder.</param>
         /// <returns>A reference to this instance after the append operation has completed.</returns>
-        public StringBuilder AppendJoin(string? separator, params ReadOnlySpan<object?> values)
+        public StringBuilder AppendJoin(string? separator, /*params*/ ReadOnlySpan<object?> values)
         {
             separator ??= string.Empty;
             return AppendJoinCore(ref separator.GetRawStringData(), separator.Length, values);
@@ -1175,7 +1175,7 @@ public StringBuilder AppendJoin(string? separator, params string?[] values)
         /// <param name="separator">The string to use as a separator. <paramref name="separator"/> is included in the joined strings only if <paramref name="values"/> has more than one element.</param>
         /// <param name="values">A span that contains the strings to concatenate and append to the current instance of the string builder.</param>
         /// <returns>A reference to this instance after the append operation has completed.</returns>
-        public StringBuilder AppendJoin(string? separator, params ReadOnlySpan<string?> values)
+        public StringBuilder AppendJoin(string? separator, /*params*/ ReadOnlySpan<string?> values)
         {
             separator ??= string.Empty;
             return AppendJoinCore(ref separator.GetRawStringData(), separator.Length, values);
@@ -1198,7 +1198,7 @@ public StringBuilder AppendJoin(char separator, params object?[] values)
         /// <param name="separator">The character to use as a separator. <paramref name="separator"/> is included in the joined strings only if <paramref name="values"/> has more than one element.</param>
         /// <param name="values">A span that contains the strings to concatenate and append to the current instance of the string builder.</param>
         /// <returns>A reference to this instance after the append operation has completed.</returns>
-        public StringBuilder AppendJoin(char separator, params ReadOnlySpan<object?> values) =>
+        public StringBuilder AppendJoin(char separator, /*params*/ ReadOnlySpan<object?> values) =>
             AppendJoinCore(ref separator, 1, values);
 
         public StringBuilder AppendJoin<T>(char separator, IEnumerable<T> values)
@@ -1228,7 +1228,7 @@ public StringBuilder AppendJoin(char separator, params string?[] values)
         /// <param name="separator">The character to use as a separator. <paramref name="separator"/> is included in the joined strings only if <paramref name="values"/> has more than one element.</param>
         /// <param name="values">A span that contains the strings to concatenate and append to the current instance of the string builder.</param>
         /// <returns>A reference to this instance after the append operation has completed.</returns>
-        public StringBuilder AppendJoin(char separator, params ReadOnlySpan<string?> values) =>
+        public StringBuilder AppendJoin(char separator, /*params*/ ReadOnlySpan<string?> values) =>
             AppendJoinCore(ref separator, 1, values);
 
         private StringBuilder AppendJoinCore<T>(ref char separator, int separatorLength, IEnumerable<T> values)
@@ -1466,7 +1466,7 @@ public StringBuilder AppendFormat([StringSyntax(StringSyntaxAttribute.CompositeF
         /// -or-
         /// The index of a format item is less than 0 (zero), or greater than or equal to the length of the <paramref name="args"/> span.
         /// </exception>
-        public StringBuilder AppendFormat([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> args)
+        public StringBuilder AppendFormat([StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> args)
         {
             return AppendFormat(null, format, args);
         }
@@ -1515,7 +1515,7 @@ public StringBuilder AppendFormat(IFormatProvider? provider, [StringSyntax(Strin
         /// -or-
         /// The index of a format item is less than 0 (zero), or greater than or equal to the length of the <paramref name="args"/> span.
         /// </exception>
-        public StringBuilder AppendFormat(IFormatProvider? provider, [StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, params ReadOnlySpan<object?> args)
+        public StringBuilder AppendFormat(IFormatProvider? provider, [StringSyntax(StringSyntaxAttribute.CompositeFormat)] string format, /*params*/ ReadOnlySpan<object?> args)
         {
             ArgumentNullException.ThrowIfNull(format);
 
@@ -1875,7 +1875,7 @@ public StringBuilder AppendFormat(IFormatProvider? provider, CompositeFormat for
         /// <returns>A reference to this instance after the append operation has completed.</returns>
         /// <exception cref="ArgumentNullException"><paramref name="format"/> is null.</exception>
         /// <exception cref="FormatException">The index of a format item is greater than or equal to the number of supplied arguments.</exception>
-        public StringBuilder AppendFormat(IFormatProvider? provider, CompositeFormat format, params ReadOnlySpan<object?> args)
+        public StringBuilder AppendFormat(IFormatProvider? provider, CompositeFormat format, /*params*/ ReadOnlySpan<object?> args)
         {
             ArgumentNullException.ThrowIfNull(format);
             format.ValidateNumberOfArgs(args.Length);
diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
index f1358083a220fc..092b9467232157 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/CancellationTokenSource.cs
@@ -877,7 +877,7 @@ public static CancellationTokenSource CreateLinkedTokenSource(params Cancellatio
         /// </summary>
         /// <param name="tokens">The <see cref="CancellationToken">CancellationToken</see> instances to observe.</param>
         /// <returns>A <see cref="CancellationTokenSource"/> that is linked to the source tokens.</returns>
-        public static CancellationTokenSource CreateLinkedTokenSource(params ReadOnlySpan<CancellationToken> tokens)
+        public static CancellationTokenSource CreateLinkedTokenSource(/*params*/ ReadOnlySpan<CancellationToken> tokens)
         {
             return tokens.Length switch
             {
diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs
index 5be4d6c8f27970..3e57afadcd3f8b 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs
@@ -4704,7 +4704,7 @@ public static void WaitAll(params Task[] tasks)
         /// the execution of at least one of the <see cref="Task"/> instances.
         /// </exception>
         [UnsupportedOSPlatform("browser")]
-        public static void WaitAll(params ReadOnlySpan<Task> tasks)
+        public static void WaitAll(/*params*/ ReadOnlySpan<Task> tasks)
         {
             bool waitResult = WaitAllCore(tasks, Timeout.Infinite, default);
             Debug.Assert(waitResult, "expected wait to succeed");
@@ -5978,7 +5978,7 @@ public static Task WhenAll(params Task[] tasks)
         /// </para>
         /// </remarks>
         /// <exception cref="ArgumentException">The <paramref name="tasks"/> array contained a null task.</exception>
-        public static Task WhenAll(params ReadOnlySpan<Task> tasks) =>
+        public static Task WhenAll(/*params*/ ReadOnlySpan<Task> tasks) =>
             tasks.Length != 0 ? new WhenAllPromise(tasks) : CompletedTask;
 
         /// <summary>A Task that gets completed when all of its constituent tasks complete.</summary>
@@ -6305,7 +6305,7 @@ public static Task<TResult[]> WhenAll<TResult>(params Task<TResult>[] tasks)
         /// <exception cref="ArgumentException">
         /// The <paramref name="tasks"/> array contained a null task.
         /// </exception>
-        public static Task<TResult[]> WhenAll<TResult>(params ReadOnlySpan<Task<TResult>> tasks)
+        public static Task<TResult[]> WhenAll<TResult>(/*params*/ ReadOnlySpan<Task<TResult>> tasks)
         {
             if (tasks.IsEmpty)
             {
@@ -6476,7 +6476,7 @@ public static Task<Task> WhenAny(params Task[] tasks)
         /// <exception cref="ArgumentException">
         /// The <paramref name="tasks"/> array contained a null task, or was empty.
         /// </exception>
-        public static Task<Task> WhenAny(params ReadOnlySpan<Task> tasks) =>
+        public static Task<Task> WhenAny(/*params*/ ReadOnlySpan<Task> tasks) =>
             WhenAnyCore(tasks);
 
         /// <summary>
@@ -6760,7 +6760,7 @@ public static Task<Task<TResult>> WhenAny<TResult>(params Task<TResult>[] tasks)
         /// <exception cref="ArgumentException">
         /// The <paramref name="tasks"/> array contained a null task, or was empty.
         /// </exception>
-        public static Task<Task<TResult>> WhenAny<TResult>(params ReadOnlySpan<Task<TResult>> tasks) =>
+        public static Task<Task<TResult>> WhenAny<TResult>(/*params*/ ReadOnlySpan<Task<TResult>> tasks) =>
             WhenAnyCore(tasks);
 
         /// <summary>Creates a task that will complete when either of the supplied tasks have completed.</summary>
diff --git a/src/libraries/System.Runtime/ref/System.Runtime.cs b/src/libraries/System.Runtime/ref/System.Runtime.cs
index 42a5c6372b4c54..29f4fcf8572319 100644
--- a/src/libraries/System.Runtime/ref/System.Runtime.cs
+++ b/src/libraries/System.Runtime/ref/System.Runtime.cs
@@ -2163,7 +2163,7 @@ protected Delegate([System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembersAt
         [return: System.Diagnostics.CodeAnalysis.NotNullIfNotNullAttribute("b")]
         public static System.Delegate? Combine(System.Delegate? a, System.Delegate? b) { throw null; }
         public static System.Delegate? Combine(params System.Delegate?[]? delegates) { throw null; }
-        public static System.Delegate? Combine(params System.ReadOnlySpan<System.Delegate?> delegates) { throw null; }
+        public static System.Delegate? Combine(/*params*/ System.ReadOnlySpan<System.Delegate?> delegates) { throw null; }
         protected virtual System.Delegate CombineImpl(System.Delegate? d) { throw null; }
         public static System.Delegate CreateDelegate(System.Type type, object? firstArgument, System.Reflection.MethodInfo method) { throw null; }
         public static System.Delegate? CreateDelegate(System.Type type, object? firstArgument, System.Reflection.MethodInfo method, bool throwOnBindFailure) { throw null; }
@@ -5243,7 +5243,7 @@ public unsafe String(sbyte* value, int startIndex, int length, System.Text.Encod
         public static string Concat(object? arg0, object? arg1) { throw null; }
         public static string Concat(object? arg0, object? arg1, object? arg2) { throw null; }
         public static string Concat(params object?[] args) { throw null; }
-        public static string Concat(params System.ReadOnlySpan<object?> args) { throw null; }
+        public static string Concat(/*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public static string Concat(System.ReadOnlySpan<char> str0, System.ReadOnlySpan<char> str1) { throw null; }
         public static string Concat(System.ReadOnlySpan<char> str0, System.ReadOnlySpan<char> str1, System.ReadOnlySpan<char> str2) { throw null; }
         public static string Concat(System.ReadOnlySpan<char> str0, System.ReadOnlySpan<char> str1, System.ReadOnlySpan<char> str2, System.ReadOnlySpan<char> str3) { throw null; }
@@ -5251,7 +5251,7 @@ public unsafe String(sbyte* value, int startIndex, int length, System.Text.Encod
         public static string Concat(string? str0, string? str1, string? str2) { throw null; }
         public static string Concat(string? str0, string? str1, string? str2, string? str3) { throw null; }
         public static string Concat(params string?[] values) { throw null; }
-        public static string Concat(params System.ReadOnlySpan<string?> values) { throw null; }
+        public static string Concat(/*params*/ System.ReadOnlySpan<string?> values) { throw null; }
         public static string Concat<T>(System.Collections.Generic.IEnumerable<T> values) { throw null; }
         public bool Contains(char value) { throw null; }
         public bool Contains(char value, System.StringComparison comparisonType) { throw null; }
@@ -5279,14 +5279,14 @@ public void CopyTo(System.Span<char> destination) { }
         public static string Format(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { throw null; }
         public static string Format(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { throw null; }
         public static string Format(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] args) { throw null; }
-        public static string Format(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public static string Format(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public static string Format(System.IFormatProvider? provider, System.Text.CompositeFormat format, params object?[] args) { throw null; }
-        public static string Format(System.IFormatProvider? provider, System.Text.CompositeFormat format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public static string Format(System.IFormatProvider? provider, System.Text.CompositeFormat format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0) { throw null; }
         public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { throw null; }
         public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { throw null; }
         public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] args) { throw null; }
-        public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public static string Format([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public static string Format<TArg0>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0) { throw null; }
         public static string Format<TArg0, TArg1>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1) { throw null; }
         public static string Format<TArg0, TArg1, TArg2>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1, TArg2 arg2) { throw null; }
@@ -5319,15 +5319,15 @@ public void CopyTo(System.Span<char> destination) { }
         public static bool IsNullOrEmpty([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(false)] string? value) { throw null; }
         public static bool IsNullOrWhiteSpace([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(false)] string? value) { throw null; }
         public static string Join(char separator, params object?[] values) { throw null; }
-        public static string Join(char separator, params System.ReadOnlySpan<object?> values) { throw null; }
+        public static string Join(char separator, /*params*/ System.ReadOnlySpan<object?> values) { throw null; }
         public static string Join(char separator, params string?[] value) { throw null; }
-        public static string Join(char separator, params System.ReadOnlySpan<string?> value) { throw null; }
+        public static string Join(char separator, /*params*/ System.ReadOnlySpan<string?> value) { throw null; }
         public static string Join(char separator, string?[] value, int startIndex, int count) { throw null; }
         public static string Join(string? separator, System.Collections.Generic.IEnumerable<string?> values) { throw null; }
         public static string Join(string? separator, params object?[] values) { throw null; }
-        public static string Join(string? separator, params System.ReadOnlySpan<object?> values) { throw null; }
+        public static string Join(string? separator, /*params*/ System.ReadOnlySpan<object?> values) { throw null; }
         public static string Join(string? separator, params string?[] value) { throw null; }
-        public static string Join(string? separator, params System.ReadOnlySpan<string?> value) { throw null; }
+        public static string Join(string? separator, /*params*/ System.ReadOnlySpan<string?> value) { throw null; }
         public static string Join(string? separator, string?[] value, int startIndex, int count) { throw null; }
         public static string Join<T>(char separator, System.Collections.Generic.IEnumerable<T> values) { throw null; }
         public static string Join<T>(string? separator, System.Collections.Generic.IEnumerable<T> values) { throw null; }
@@ -5363,7 +5363,7 @@ public void CopyTo(System.Span<char> destination) { }
         public string[] Split(char separator, int count, System.StringSplitOptions options = System.StringSplitOptions.None) { throw null; }
         public string[] Split(char separator, System.StringSplitOptions options = System.StringSplitOptions.None) { throw null; }
         public string[] Split(params char[]? separator) { throw null; }
-        public string[] Split(params System.ReadOnlySpan<char> separator) { throw null; }
+        public string[] Split(/*params*/ System.ReadOnlySpan<char> separator) { throw null; }
         public string[] Split(char[]? separator, int count) { throw null; }
         public string[] Split(char[]? separator, int count, System.StringSplitOptions options) { throw null; }
         public string[] Split(char[]? separator, System.StringSplitOptions options) { throw null; }
@@ -5411,15 +5411,15 @@ public void CopyTo(System.Span<char> destination) { }
         public string Trim() { throw null; }
         public string Trim(char trimChar) { throw null; }
         public string Trim(params char[]? trimChars) { throw null; }
-        public string Trim(params System.ReadOnlySpan<char> trimChars) { throw null; }
+        public string Trim(/*params*/ System.ReadOnlySpan<char> trimChars) { throw null; }
         public string TrimEnd() { throw null; }
         public string TrimEnd(char trimChar) { throw null; }
         public string TrimEnd(params char[]? trimChars) { throw null; }
-        public string TrimEnd(params System.ReadOnlySpan<char> trimChars) { throw null; }
+        public string TrimEnd(/*params*/ System.ReadOnlySpan<char> trimChars) { throw null; }
         public string TrimStart() { throw null; }
         public string TrimStart(char trimChar) { throw null; }
         public string TrimStart(params char[]? trimChars) { throw null; }
-        public string TrimStart(params System.ReadOnlySpan<char> trimChars) { throw null; }
+        public string TrimStart(/*params*/ System.ReadOnlySpan<char> trimChars) { throw null; }
         public bool TryCopyTo(System.Span<char> destination) { throw null; }
     }
     public abstract partial class StringComparer : System.Collections.Generic.IComparer<string?>, System.Collections.Generic.IEqualityComparer<string?>, System.Collections.IComparer, System.Collections.IEqualityComparer
@@ -7540,7 +7540,7 @@ public override void Write(string? s) { }
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0) { }
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         public override System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
@@ -7560,7 +7560,7 @@ public override void WriteLine(string? s) { }
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0) { }
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         [System.CLSCompliantAttribute(false)]
         public override void WriteLine(uint value) { }
         public override System.Threading.Tasks.Task WriteLineAsync() { throw null; }
@@ -10127,7 +10127,7 @@ public static partial class Path
         public static string Combine(string path1, string path2, string path3) { throw null; }
         public static string Combine(string path1, string path2, string path3, string path4) { throw null; }
         public static string Combine(params string[] paths) { throw null; }
-        public static string Combine(params System.ReadOnlySpan<string> paths) { throw null; }
+        public static string Combine(/*params*/ System.ReadOnlySpan<string> paths) { throw null; }
         public static bool EndsInDirectorySeparator(System.ReadOnlySpan<char> path) { throw null; }
         public static bool EndsInDirectorySeparator([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] string? path) { throw null; }
         public static bool Exists([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] string? path) { throw null; }
@@ -10165,7 +10165,7 @@ public static partial class Path
         public static string Join(string? path1, string? path2, string? path3) { throw null; }
         public static string Join(string? path1, string? path2, string? path3, string? path4) { throw null; }
         public static string Join(params string?[] paths) { throw null; }
-        public static string Join(params System.ReadOnlySpan<string?> paths) { throw null; }
+        public static string Join(/*params*/ System.ReadOnlySpan<string?> paths) { throw null; }
         public static System.ReadOnlySpan<char> TrimEndingDirectorySeparator(System.ReadOnlySpan<char> path) { throw null; }
         public static string TrimEndingDirectorySeparator(string path) { throw null; }
         public static bool TryJoin(System.ReadOnlySpan<char> path1, System.ReadOnlySpan<char> path2, System.ReadOnlySpan<char> path3, System.Span<char> destination, out int charsWritten) { throw null; }
@@ -10332,7 +10332,7 @@ public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribut
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public override void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         public override System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
@@ -10343,7 +10343,7 @@ public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttr
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public override void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         public override System.Threading.Tasks.Task WriteLineAsync() { throw null; }
         public override System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
         public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
@@ -10461,7 +10461,7 @@ public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute
         public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public virtual void Write([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         public virtual void Write(System.Text.StringBuilder? value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void Write(uint value) { }
@@ -10490,7 +10490,7 @@ public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttri
         public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { }
         public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { }
         public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] arg) { }
-        public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> arg) { }
+        public virtual void WriteLine([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> arg) { }
         public virtual void WriteLine(System.Text.StringBuilder? value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void WriteLine(uint value) { }
@@ -14936,25 +14936,25 @@ public StringBuilder(string? value, int startIndex, int length, int capacity) {
         public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { throw null; }
         public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { throw null; }
         public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] args) { throw null; }
-        public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, [System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, System.Text.CompositeFormat format, params object?[] args) { throw null; }
-        public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, System.Text.CompositeFormat format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public System.Text.StringBuilder AppendFormat(System.IFormatProvider? provider, System.Text.CompositeFormat format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0) { throw null; }
         public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1) { throw null; }
         public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, object? arg0, object? arg1, object? arg2) { throw null; }
         public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params object?[] args) { throw null; }
-        public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, params System.ReadOnlySpan<object?> args) { throw null; }
+        public System.Text.StringBuilder AppendFormat([System.Diagnostics.CodeAnalysis.StringSyntaxAttribute("CompositeFormat")] string format, /*params*/ System.ReadOnlySpan<object?> args) { throw null; }
         public System.Text.StringBuilder AppendFormat<TArg0>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0) { throw null; }
         public System.Text.StringBuilder AppendFormat<TArg0, TArg1>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1) { throw null; }
         public System.Text.StringBuilder AppendFormat<TArg0, TArg1, TArg2>(System.IFormatProvider? provider, System.Text.CompositeFormat format, TArg0 arg0, TArg1 arg1, TArg2 arg2) { throw null; }
         public System.Text.StringBuilder AppendJoin(char separator, params object?[] values) { throw null; }
         public System.Text.StringBuilder AppendJoin(char separator, params string?[] values) { throw null; }
-        public System.Text.StringBuilder AppendJoin(char separator, params System.ReadOnlySpan<object?> values) { throw null; }
-        public System.Text.StringBuilder AppendJoin(char separator, params System.ReadOnlySpan<string?> values) { throw null; }
+        public System.Text.StringBuilder AppendJoin(char separator, /*params*/ System.ReadOnlySpan<object?> values) { throw null; }
+        public System.Text.StringBuilder AppendJoin(char separator, /*params*/ System.ReadOnlySpan<string?> values) { throw null; }
         public System.Text.StringBuilder AppendJoin(string? separator, params object?[] values) { throw null; }
         public System.Text.StringBuilder AppendJoin(string? separator, params string?[] values) { throw null; }
-        public System.Text.StringBuilder AppendJoin(string? separator, params System.ReadOnlySpan<object?> values) { throw null; }
-        public System.Text.StringBuilder AppendJoin(string? separator, params System.ReadOnlySpan<string?> values) { throw null; }
+        public System.Text.StringBuilder AppendJoin(string? separator, /*params*/ System.ReadOnlySpan<object?> values) { throw null; }
+        public System.Text.StringBuilder AppendJoin(string? separator, /*params*/ System.ReadOnlySpan<string?> values) { throw null; }
         public System.Text.StringBuilder AppendJoin<T>(char separator, System.Collections.Generic.IEnumerable<T> values) { throw null; }
         public System.Text.StringBuilder AppendJoin<T>(string? separator, System.Collections.Generic.IEnumerable<T> values) { throw null; }
         public System.Text.StringBuilder AppendLine() { throw null; }
@@ -15130,7 +15130,7 @@ public void CancelAfter(System.TimeSpan delay) { }
         public System.Threading.Tasks.Task CancelAsync() { throw null; }
         public static System.Threading.CancellationTokenSource CreateLinkedTokenSource(System.Threading.CancellationToken token) { throw null; }
         public static System.Threading.CancellationTokenSource CreateLinkedTokenSource(System.Threading.CancellationToken token1, System.Threading.CancellationToken token2) { throw null; }
-        public static System.Threading.CancellationTokenSource CreateLinkedTokenSource(params System.ReadOnlySpan<System.Threading.CancellationToken> tokens) { throw null; }
+        public static System.Threading.CancellationTokenSource CreateLinkedTokenSource(/*params*/ System.ReadOnlySpan<System.Threading.CancellationToken> tokens) { throw null; }
         public static System.Threading.CancellationTokenSource CreateLinkedTokenSource(params System.Threading.CancellationToken[] tokens) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
@@ -15337,7 +15337,7 @@ public void Wait(System.Threading.CancellationToken cancellationToken) { }
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public static void WaitAll(System.Collections.Generic.IEnumerable<Task> tasks, System.Threading.CancellationToken cancellationToken = default) { }
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
-        public static void WaitAll(params System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { }
+        public static void WaitAll(/*params*/ System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { }
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public static void WaitAll(params System.Threading.Tasks.Task[] tasks) { }
         [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
@@ -15359,18 +15359,18 @@ public static void WaitAll(System.Threading.Tasks.Task[] tasks, System.Threading
         public System.Threading.Tasks.Task WaitAsync(System.TimeSpan timeout, System.TimeProvider timeProvider) { throw null; }
         public System.Threading.Tasks.Task WaitAsync(System.TimeSpan timeout, System.TimeProvider timeProvider, System.Threading.CancellationToken cancellationToken) { throw null; }
         public static System.Threading.Tasks.Task WhenAll(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task> tasks) { throw null; }
-        public static System.Threading.Tasks.Task WhenAll(params System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { throw null; }
+        public static System.Threading.Tasks.Task WhenAll(/*params*/ System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { throw null; }
         public static System.Threading.Tasks.Task WhenAll(params System.Threading.Tasks.Task[] tasks) { throw null; }
         public static System.Threading.Tasks.Task<TResult[]> WhenAll<TResult>(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
-        public static System.Threading.Tasks.Task<TResult[]> WhenAll<TResult>(params System.ReadOnlySpan<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
+        public static System.Threading.Tasks.Task<TResult[]> WhenAll<TResult>(/*params*/ System.ReadOnlySpan<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
         public static System.Threading.Tasks.Task<TResult[]> WhenAll<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task> tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(System.Threading.Tasks.Task task1, System.Threading.Tasks.Task task2) { throw null; }
-        public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(params System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { throw null; }
+        public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(/*params*/ System.ReadOnlySpan<System.Threading.Tasks.Task> tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task> WhenAny(params System.Threading.Tasks.Task[] tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(System.Threading.Tasks.Task<TResult> task1, System.Threading.Tasks.Task<TResult> task2) { throw null; }
-        public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.ReadOnlySpan<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
+        public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(/*params*/ System.ReadOnlySpan<System.Threading.Tasks.Task<TResult>> tasks) { throw null; }
         public static System.Threading.Tasks.Task<System.Threading.Tasks.Task<TResult>> WhenAny<TResult>(params System.Threading.Tasks.Task<TResult>[] tasks) { throw null; }
         public static System.Collections.Generic.IAsyncEnumerable<System.Threading.Tasks.Task> WhenEach(System.Collections.Generic.IEnumerable<System.Threading.Tasks.Task> tasks) { throw null; }
         public static System.Collections.Generic.IAsyncEnumerable<System.Threading.Tasks.Task> WhenEach(params System.Threading.Tasks.Task[] tasks) { throw null; }
diff --git a/src/libraries/System.Runtime/tests/System.IO.Tests/IndentedTextWriter.cs b/src/libraries/System.Runtime/tests/System.IO.Tests/IndentedTextWriter.cs
index 11b9ad7b82a193..84ebd066786a22 100644
--- a/src/libraries/System.Runtime/tests/System.IO.Tests/IndentedTextWriter.cs
+++ b/src/libraries/System.Runtime/tests/System.IO.Tests/IndentedTextWriter.cs
@@ -104,7 +104,7 @@ public override void Write(string format, params object[] arg)
                 LastCalledMethod = nameof(Write);
             }
 
-            public override void Write(string format, params ReadOnlySpan<object?> arg)
+            public override void Write(string format, /*params*/ ReadOnlySpan<object?> arg)
             {
                 base.Write(format, arg);
                 LastCalledMethod = nameof(Write);
@@ -218,7 +218,7 @@ public override void WriteLine(string format, params object[] arg)
                 LastCalledMethod = nameof(WriteLine);
             }
 
-            public override void WriteLine(string format, params ReadOnlySpan<object?> arg)
+            public override void WriteLine(string format, /*params*/ ReadOnlySpan<object?> arg)
             {
                 base.WriteLine(format, arg);
                 LastCalledMethod = nameof(WriteLine);
diff --git a/src/libraries/System.Text.Json/ref/System.Text.Json.cs b/src/libraries/System.Text.Json/ref/System.Text.Json.cs
index 4b0bc43d2a4cc5..a3b7f6dbf1ceda 100644
--- a/src/libraries/System.Text.Json/ref/System.Text.Json.cs
+++ b/src/libraries/System.Text.Json/ref/System.Text.Json.cs
@@ -659,9 +659,9 @@ namespace System.Text.Json.Nodes
     public sealed partial class JsonArray : System.Text.Json.Nodes.JsonNode, System.Collections.Generic.ICollection<System.Text.Json.Nodes.JsonNode?>, System.Collections.Generic.IEnumerable<System.Text.Json.Nodes.JsonNode?>, System.Collections.Generic.IList<System.Text.Json.Nodes.JsonNode?>, System.Collections.IEnumerable
     {
         public JsonArray(System.Text.Json.Nodes.JsonNodeOptions? options = default(System.Text.Json.Nodes.JsonNodeOptions?)) { }
-        public JsonArray(System.Text.Json.Nodes.JsonNodeOptions options, params System.ReadOnlySpan<System.Text.Json.Nodes.JsonNode?> items) { }
+        public JsonArray(System.Text.Json.Nodes.JsonNodeOptions options, /*params*/ System.ReadOnlySpan<System.Text.Json.Nodes.JsonNode?> items) { }
         public JsonArray(System.Text.Json.Nodes.JsonNodeOptions options, params System.Text.Json.Nodes.JsonNode?[] items) { }
-        public JsonArray(params System.ReadOnlySpan<System.Text.Json.Nodes.JsonNode?> items) { }
+        public JsonArray(/*params*/ System.ReadOnlySpan<System.Text.Json.Nodes.JsonNode?> items) { }
         public JsonArray(params System.Text.Json.Nodes.JsonNode?[] items) { }
         public int Count { get { throw null; } }
         bool System.Collections.Generic.ICollection<System.Text.Json.Nodes.JsonNode?>.IsReadOnly { get { throw null; } }
@@ -1354,7 +1354,7 @@ public enum JsonTypeInfoKind
     }
     public static partial class JsonTypeInfoResolver
     {
-        public static System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver Combine(params System.ReadOnlySpan<System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver?> resolvers) { throw null; }
+        public static System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver Combine(/*params*/ System.ReadOnlySpan<System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver?> resolvers) { throw null; }
         public static System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver Combine(params System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver?[] resolvers) { throw null; }
         public static System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver WithAddedModifier(this System.Text.Json.Serialization.Metadata.IJsonTypeInfoResolver resolver, System.Action<System.Text.Json.Serialization.Metadata.JsonTypeInfo> modifier) { throw null; }
     }
diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/Nodes/JsonArray.cs b/src/libraries/System.Text.Json/src/System/Text/Json/Nodes/JsonArray.cs
index b5c4ee1883b1bf..600249db627b2b 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/Nodes/JsonArray.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/Nodes/JsonArray.cs
@@ -44,7 +44,7 @@ public JsonArray(JsonNodeOptions options, params JsonNode?[] items) : base(optio
         /// </summary>
         /// <param name="options">Options to control the behavior.</param>
         /// <param name="items">The items to add to the new <see cref="JsonArray"/>.</param>
-        public JsonArray(JsonNodeOptions options, params ReadOnlySpan<JsonNode?> items) : base(options)
+        public JsonArray(JsonNodeOptions options, /*params*/ ReadOnlySpan<JsonNode?> items) : base(options)
         {
             InitializeFromSpan(items);
         }
@@ -62,7 +62,7 @@ public JsonArray(params JsonNode?[] items) : base()
         ///   Initializes a new instance of the <see cref="JsonArray"/> class that contains items from the specified span.
         /// </summary>
         /// <param name="items">The items to add to the new <see cref="JsonArray"/>.</param>
-        public JsonArray(params ReadOnlySpan<JsonNode?> items) : base()
+        public JsonArray(/*params*/ ReadOnlySpan<JsonNode?> items) : base()
         {
             InitializeFromSpan(items);
         }
diff --git a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoResolver.cs b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoResolver.cs
index 58cc32c795e45e..9bd63188cbe525 100644
--- a/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoResolver.cs
+++ b/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/JsonTypeInfoResolver.cs
@@ -47,7 +47,7 @@ public static IJsonTypeInfoResolver Combine(params IJsonTypeInfoResolver?[] reso
         /// which typically define contract metadata for small subsets of types.
         /// It can also be used to fall back to <see cref="DefaultJsonTypeInfoResolver"/> wherever necessary.
         /// </remarks>
-        public static IJsonTypeInfoResolver Combine(params ReadOnlySpan<IJsonTypeInfoResolver?> resolvers)
+        public static IJsonTypeInfoResolver Combine(/*params*/ ReadOnlySpan<IJsonTypeInfoResolver?> resolvers)
         {
             var resolverChain = new JsonTypeInfoResolverChain();
             foreach (IJsonTypeInfoResolver? resolver in resolvers)
diff --git a/src/libraries/System.Threading.Tasks.Dataflow/System.Threading.Tasks.Dataflow.sln b/src/libraries/System.Threading.Tasks.Dataflow/System.Threading.Tasks.Dataflow.sln
index cb2cf47a201860..3b9addcd7f2ffd 100644
--- a/src/libraries/System.Threading.Tasks.Dataflow/System.Threading.Tasks.Dataflow.sln
+++ b/src/libraries/System.Threading.Tasks.Dataflow/System.Threading.Tasks.Dataflow.sln
@@ -1,4 +1,8 @@
-Microsoft Visual Studio Solution File, Format Version 12.00
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.11.34814.40
+MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TestUtilities", "..\Common\tests\TestUtilities\TestUtilities.csproj", "{48428161-C841-43D4-8BD3-195A3D5C36C5}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "LibraryImportGenerator", "..\System.Runtime.InteropServices\gen\LibraryImportGenerator\LibraryImportGenerator.csproj", "{986667FC-4DA5-4496-B998-7DEB9879B180}"
@@ -31,11 +35,11 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ref", "ref", "{E6ED6A93-597
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{D4D4FFCB-0DAF-4CDC-8945-7B31D2197D66}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "gen", "tools\gen", "{AF7C2885-ABE5-4636-B583-5F40FBB47B3A}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "gen", "gen", "{AF7C2885-ABE5-4636-B583-5F40FBB47B3A}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "tools\src", "{B3784B87-6E0A-41A1-B82D-05AE560F82CE}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{B3784B87-6E0A-41A1-B82D-05AE560F82CE}"
 EndProject
-Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ref", "tools\ref", "{62CAF4CA-64E5-4023-ACE0-79B3071221ED}"
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "ref", "ref", "{62CAF4CA-64E5-4023-ACE0-79B3071221ED}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tools", "tools", "{7484FF57-320D-436A-B73D-6A9E436970AC}"
 EndProject
@@ -99,22 +103,26 @@ Global
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{48428161-C841-43D4-8BD3-195A3D5C36C5} = {D7C6E667-E868-423C-883D-CBDE73BFF66E}
-		{51B191E6-C503-4949-8AD0-CF338FE13ADB} = {D7C6E667-E868-423C-883D-CBDE73BFF66E}
 		{986667FC-4DA5-4496-B998-7DEB9879B180} = {AA3208A1-2A91-46D3-B09C-1A9CCF90235E}
 		{C4865002-095A-4B99-A737-216DC112ACA4} = {AA3208A1-2A91-46D3-B09C-1A9CCF90235E}
 		{784D5C28-1B02-4DF5-A95F-5F453FD96828} = {E6ED6A93-5971-4E87-972C-23E80F6E0CFC}
 		{BD042162-B4E2-45AC-8225-699F25478852} = {E6ED6A93-5971-4E87-972C-23E80F6E0CFC}
 		{EA4AFF05-8124-4D15-A7A3-C731C21728BB} = {D4D4FFCB-0DAF-4CDC-8945-7B31D2197D66}
+		{51B191E6-C503-4949-8AD0-CF338FE13ADB} = {D7C6E667-E868-423C-883D-CBDE73BFF66E}
 		{9F1E4720-AC8C-40BD-AB5D-67C2A9426D10} = {AF7C2885-ABE5-4636-B583-5F40FBB47B3A}
 		{8B8A555E-DC83-47DE-A730-D95EFC82ECBD} = {AF7C2885-ABE5-4636-B583-5F40FBB47B3A}
-		{AF7C2885-ABE5-4636-B583-5F40FBB47B3A} = {7484FF57-320D-436A-B73D-6A9E436970AC}
 		{6844D905-EFFE-40AC-8012-E33483780476} = {B3784B87-6E0A-41A1-B82D-05AE560F82CE}
 		{F7FA210C-6D0C-419D-A13F-C2E1F846E731} = {B3784B87-6E0A-41A1-B82D-05AE560F82CE}
-		{B3784B87-6E0A-41A1-B82D-05AE560F82CE} = {7484FF57-320D-436A-B73D-6A9E436970AC}
 		{D2727CE8-7A93-458F-B232-4B470E1BB598} = {62CAF4CA-64E5-4023-ACE0-79B3071221ED}
+		{AF7C2885-ABE5-4636-B583-5F40FBB47B3A} = {7484FF57-320D-436A-B73D-6A9E436970AC}
+		{B3784B87-6E0A-41A1-B82D-05AE560F82CE} = {7484FF57-320D-436A-B73D-6A9E436970AC}
 		{62CAF4CA-64E5-4023-ACE0-79B3071221ED} = {7484FF57-320D-436A-B73D-6A9E436970AC}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {0C9180F6-E88A-4F7E-801E-455E97B34F83}
 	EndGlobalSection
+	GlobalSection(SharedMSBuildProjectFiles) = preSolution
+		..\..\tools\illink\src\ILLink.Shared\ILLink.Shared.projitems*{8b8a555e-dc83-47de-a730-d95efc82ecbd}*SharedItemsImports = 5
+		..\..\tools\illink\src\ILLink.Shared\ILLink.Shared.projitems*{f7fa210c-6d0c-419d-a13f-c2e1f846e731}*SharedItemsImports = 5
+	EndGlobalSection
 EndGlobal