Revert "Added support for splitting on ReadOnlySpan<char> (#295)"

src/libraries/System.Memory/ref/System.Memory.cs

@@ -91,9 +91,6 @@ public static void Sort<T>(this System.Span<T> span, System.Comparison<T> compar
         public static void Sort<TKey, TValue>(this System.Span<TKey> keys, System.Span<TValue> items) { }
         public static void Sort<TKey, TValue, TComparer>(this System.Span<TKey> keys, System.Span<TValue> items, TComparer comparer) where TComparer : System.Collections.Generic.IComparer<TKey>? { }
         public static void Sort<TKey, TValue>(this System.Span<TKey> keys, System.Span<TValue> items, System.Comparison<TKey> comparison) { }
-        public static System.SpanSplitEnumerator<char> Split(this System.ReadOnlySpan<char> span) { throw null; }
-        public static System.SpanSplitEnumerator<char> Split(this System.ReadOnlySpan<char> span, char separator) { throw null; }
-        public static System.SpanSplitEnumerator<char> Split(this System.ReadOnlySpan<char> span, string separator) { throw null; }
         public static bool StartsWith(this System.ReadOnlySpan<char> span, System.ReadOnlySpan<char> value, System.StringComparison comparisonType) { throw null; }
         public static bool StartsWith<T>(this System.ReadOnlySpan<T> span, System.ReadOnlySpan<T> value) where T : System.IEquatable<T> { throw null; }
         public static bool StartsWith<T>(this System.Span<T> span, System.ReadOnlySpan<T> value) where T : System.IEquatable<T> { throw null; }
@@ -159,12 +156,6 @@ public static void Sort<TKey, TValue>(this System.Span<TKey> keys, System.Span<T
         [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
         public object? GetObject() { throw null; }
     }
-    public ref struct SpanSplitEnumerator<T> where T : System.IEquatable<T>
-    {
-        public System.SpanSplitEnumerator<T> GetEnumerator() { throw null; }
-        public readonly System.Range Current { get { throw null; } }
-        public bool MoveNext() { throw null; }
-    }
 }
 namespace System.Buffers
 {

src/libraries/System.Memory/tests/System.Memory.Tests.csproj

@@ -165,7 +165,6 @@
     <Compile Include="ReadOnlySpan\SequenceEqual.long.cs" />
     <Compile Include="ReadOnlySpan\SequenceEqual.T.cs" />
     <Compile Include="ReadOnlySpan\Slice.cs" />
-    <Compile Include="ReadOnlySpan\Split.char.cs" />
     <Compile Include="ReadOnlySpan\StartsWith.byte.cs" />
     <Compile Include="ReadOnlySpan\StartsWith.long.cs" />
     <Compile Include="ReadOnlySpan\StartsWith.T.cs" />

src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems

@@ -416,7 +416,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\MemoryDebugView.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\MemoryExtensions.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\MemoryExtensions.Globalization.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)System\MemoryExtensions.Split.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\MemoryExtensions.Trim.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\MethodAccessException.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\MidpointRounding.cs" />
@@ -857,7 +856,6 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\SpanHelpers.Char.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\SpanHelpers.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\SpanHelpers.T.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)System\SpanSplitEnumerator.T.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\SR.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\StackOverflowException.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\String.Comparison.cs" />