Apply OverloadResolutionPriority to Span-based delegating to ROS counterparts

src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.cs

@@ -219,10 +219,12 @@ public static System.Collections.Immutable.ImmutableArray<TResult> CreateRange<T
         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; }
+        [System.Runtime.CompilerServices.OverloadResolutionPriorityAttribute(-1)]
         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; }
         public static System.Collections.Immutable.ImmutableArray<T> ToImmutableArray<T>(this System.ReadOnlySpan<T> items) { throw null; }
+        [System.Runtime.CompilerServices.OverloadResolutionPriorityAttribute(-1)]
         public static System.Collections.Immutable.ImmutableArray<T> ToImmutableArray<T>(this System.Span<T> items) { throw null; }
     }
     [System.Runtime.CompilerServices.CollectionBuilderAttribute(typeof(System.Collections.Immutable.ImmutableArray), "Create")]

src/libraries/System.Collections.Immutable/ref/System.Collections.Immutable.csproj

@@ -19,6 +19,10 @@
     <Compile Include="System.Collections.Immutable.net9.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net9.0'))">
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\OverloadResolutionPriorityAttribute.cs" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetFramework)' == '$(NetCoreAppCurrent)'">
     <ProjectReference Include="$(LibrariesProjectRoot)System.Collections\ref\System.Collections.csproj" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Runtime\ref\System.Runtime.csproj" />
@@ -28,4 +32,4 @@
     <PackageReference Include="System.Memory" Version="$(SystemMemoryVersion)" />
   </ItemGroup>
 
-</Project>
+</Project>

src/libraries/System.Collections.Immutable/src/System.Collections.Immutable.csproj

@@ -156,6 +156,10 @@ The System.Collections.Immutable library is built-in as part of the shared frame
     <Compile Include="System\Collections\Frozen\String\OrdinalStringFrozenSet.AlternateLookup.cs" />
   </ItemGroup>
 
+  <ItemGroup Condition="!$([MSBuild]::IsTargetFrameworkCompatible('$(TargetFramework)', 'net9.0'))">
+    <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\OverloadResolutionPriorityAttribute.cs" />
+  </ItemGroup>
+
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' != '.NETCoreApp'">
     <Compile Include="$(CoreLibSharedDir)System\Runtime\CompilerServices\CollectionBuilderAttribute.cs" Link="System\Runtime\CompilerServices\CollectionBuilderAttribute.cs" />
   </ItemGroup>

src/libraries/System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Runtime.CompilerServices;
 
 namespace System.Collections.Immutable
 {
@@ -104,6 +105,7 @@ public static ImmutableArray<T> Create<T>(params ReadOnlySpan<T> items)
         /// <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>
+        [OverloadResolutionPriority(-1)]
         public static ImmutableArray<T> Create<T>(Span<T> items)
         {
             return Create((ReadOnlySpan<T>)items);
@@ -126,6 +128,7 @@ public static ImmutableArray<T> ToImmutableArray<T>(this ReadOnlySpan<T> items)
         /// <typeparam name="T">The type of element in the list.</typeparam>
         /// <param name="items">The elements to store in the array.</param>
         /// <returns>An immutable array containing the specified items.</returns>
+        [OverloadResolutionPriority(-1)]
         public static ImmutableArray<T> ToImmutableArray<T>(this Span<T> items)
         {
             return Create((ReadOnlySpan<T>)items);

src/libraries/System.Numerics.Vectors/ref/System.Numerics.Vectors.cs

@@ -762,6 +762,7 @@ public readonly void CopyTo(System.Span<float> destination) { }
         private readonly int _dummyPrimitive;
         public Vector(System.ReadOnlySpan<byte> values) { throw null; }
         public Vector(System.ReadOnlySpan<T> values) { throw null; }
+        [System.Runtime.CompilerServices.OverloadResolutionPriorityAttribute(-1)]
         public Vector(System.Span<T> values) { throw null; }
         public Vector(T value) { throw null; }
         public Vector(T[] values) { throw null; }

src/libraries/System.Private.CoreLib/src/System/MemoryExtensions.Globalization.cs

@@ -378,6 +378,7 @@ public static SpanRuneEnumerator EnumerateRunes(this ReadOnlySpan<char> span)
         /// <remarks>
         /// Invalid sequences will be represented in the enumeration by <see cref="Rune.ReplacementChar"/>.
         /// </remarks>
+        [OverloadResolutionPriority(-1)]
         public static SpanRuneEnumerator EnumerateRunes(this Span<char> span)
         {
             return new SpanRuneEnumerator(span);
@@ -404,6 +405,7 @@ public static SpanLineEnumerator EnumerateLines(this ReadOnlySpan<char> span)
         /// for <see cref="string.ReplaceLineEndings"/> for more information on how newline
         /// sequences are detected.
         /// </remarks>
+        [OverloadResolutionPriority(-1)]
         public static SpanLineEnumerator EnumerateLines(this Span<char> span)
         {
             return new SpanLineEnumerator(span);