Apply changes from https://github.com/mono/mono/pull/11783 to API snapshot

3 files changed, 36 insertions, 129 deletions

diff --git a/profiles/monodroid/mscorlib.cs b/profiles/monodroid/mscorlib.cs
index c4eeba7..206309c 100644
--- a/profiles/monodroid/mscorlib.cs
+++ b/profiles/monodroid/mscorlib.cs
@@ -9827,7 +9827,6 @@ namespace System.IO
         public override string ReadToEnd() { throw null; }
         public override System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public partial class StreamWriter : System.IO.TextWriter
     {
@@ -9839,7 +9838,6 @@ namespace System.IO
         public StreamWriter(string path) { }
         public StreamWriter(string path, bool append) { }
         public StreamWriter(string path, bool append, System.Text.Encoding encoding) { }
-        [System.Security.SecuritySafeCriticalAttribute]
         public StreamWriter(string path, bool append, System.Text.Encoding encoding, int bufferSize) { }
         public virtual bool AutoFlush { get { throw null; } set { } }
         public virtual System.IO.Stream BaseStream { get { throw null; } }
@@ -9847,33 +9845,22 @@ namespace System.IO
         public override void Close() { }
         protected override void Dispose(bool disposing) { }
         public override void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task FlushAsync() { throw null; }
         public override void Write(char value) { }
-        public override void Write(char[] buffer) { }
-        public override void Write(char[] buffer, int index, int count) { }
-        public override void Write(string value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer, int index, int count) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(System.ReadOnlySpan<char> buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(string value) { }
         public override System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(System.ReadOnlySpan<char> value) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(string value) { }
         public override System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
@@ -9959,7 +9946,6 @@ namespace System.IO
         public virtual System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
         public static System.IO.TextReader Synchronized(System.IO.TextReader reader) { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public abstract partial class TextWriter : System.MarshalByRefObject, System.IDisposable
     {
@@ -9974,10 +9960,7 @@ namespace System.IO
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
         public virtual void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task FlushAsync() { throw null; }
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Synchronization=true)]
         public static System.IO.TextWriter Synchronized(System.IO.TextWriter writer) { throw null; }
         public virtual void Write(bool value) { }
         public virtual void Write(char value) { }
@@ -9988,6 +9971,7 @@ namespace System.IO
         public virtual void Write(int value) { }
         public virtual void Write(long value) { }
         public virtual void Write(object value) { }
+        public virtual void Write(System.ReadOnlySpan<char> buffer) { }
         public virtual void Write(float value) { }
         public virtual void Write(string value) { }
         public virtual void Write(string format, object arg0) { }
@@ -9998,17 +9982,10 @@ namespace System.IO
         public virtual void Write(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void Write(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
         public virtual void WriteLine() { }
         public virtual void WriteLine(bool value) { }
@@ -10020,6 +9997,7 @@ namespace System.IO
         public virtual void WriteLine(int value) { }
         public virtual void WriteLine(long value) { }
         public virtual void WriteLine(object value) { }
+        public virtual void WriteLine(System.ReadOnlySpan<char> buffer) { }
         public virtual void WriteLine(float value) { }
         public virtual void WriteLine(string value) { }
         public virtual void WriteLine(string format, object arg0) { }
@@ -10030,20 +10008,11 @@ namespace System.IO
         public virtual void WriteLine(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void WriteLine(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteLineAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     public partial class UnmanagedMemoryAccessor : System.IDisposable
diff --git a/profiles/monotouch/mscorlib.cs b/profiles/monotouch/mscorlib.cs
index 38e80d9..f1f365c 100644
--- a/profiles/monotouch/mscorlib.cs
+++ b/profiles/monotouch/mscorlib.cs
@@ -9798,7 +9798,6 @@ namespace System.IO
         public override string ReadToEnd() { throw null; }
         public override System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public partial class StreamWriter : System.IO.TextWriter
     {
@@ -9810,7 +9809,6 @@ namespace System.IO
         public StreamWriter(string path) { }
         public StreamWriter(string path, bool append) { }
         public StreamWriter(string path, bool append, System.Text.Encoding encoding) { }
-        [System.Security.SecuritySafeCriticalAttribute]
         public StreamWriter(string path, bool append, System.Text.Encoding encoding, int bufferSize) { }
         public virtual bool AutoFlush { get { throw null; } set { } }
         public virtual System.IO.Stream BaseStream { get { throw null; } }
@@ -9818,33 +9816,22 @@ namespace System.IO
         public override void Close() { }
         protected override void Dispose(bool disposing) { }
         public override void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task FlushAsync() { throw null; }
         public override void Write(char value) { }
-        public override void Write(char[] buffer) { }
-        public override void Write(char[] buffer, int index, int count) { }
-        public override void Write(string value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer, int index, int count) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(System.ReadOnlySpan<char> buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(string value) { }
         public override System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(System.ReadOnlySpan<char> value) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(string value) { }
         public override System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
@@ -9930,7 +9917,6 @@ namespace System.IO
         public virtual System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
         public static System.IO.TextReader Synchronized(System.IO.TextReader reader) { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public abstract partial class TextWriter : System.MarshalByRefObject, System.IDisposable
     {
@@ -9945,10 +9931,7 @@ namespace System.IO
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
         public virtual void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task FlushAsync() { throw null; }
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Synchronization=true)]
         public static System.IO.TextWriter Synchronized(System.IO.TextWriter writer) { throw null; }
         public virtual void Write(bool value) { }
         public virtual void Write(char value) { }
@@ -9959,6 +9942,7 @@ namespace System.IO
         public virtual void Write(int value) { }
         public virtual void Write(long value) { }
         public virtual void Write(object value) { }
+        public virtual void Write(System.ReadOnlySpan<char> buffer) { }
         public virtual void Write(float value) { }
         public virtual void Write(string value) { }
         public virtual void Write(string format, object arg0) { }
@@ -9969,17 +9953,10 @@ namespace System.IO
         public virtual void Write(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void Write(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
         public virtual void WriteLine() { }
         public virtual void WriteLine(bool value) { }
@@ -9991,6 +9968,7 @@ namespace System.IO
         public virtual void WriteLine(int value) { }
         public virtual void WriteLine(long value) { }
         public virtual void WriteLine(object value) { }
+        public virtual void WriteLine(System.ReadOnlySpan<char> buffer) { }
         public virtual void WriteLine(float value) { }
         public virtual void WriteLine(string value) { }
         public virtual void WriteLine(string format, object arg0) { }
@@ -10001,20 +9979,11 @@ namespace System.IO
         public virtual void WriteLine(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void WriteLine(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteLineAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     public partial class UnmanagedMemoryAccessor : System.IDisposable
diff --git a/profiles/net_4_x/mscorlib.cs b/profiles/net_4_x/mscorlib.cs
index 5023d0c..9d4a45d 100644
--- a/profiles/net_4_x/mscorlib.cs
+++ b/profiles/net_4_x/mscorlib.cs
@@ -9862,7 +9862,6 @@ namespace System.IO
         public override string ReadToEnd() { throw null; }
         public override System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public partial class StreamWriter : System.IO.TextWriter
     {
@@ -9874,7 +9873,6 @@ namespace System.IO
         public StreamWriter(string path) { }
         public StreamWriter(string path, bool append) { }
         public StreamWriter(string path, bool append, System.Text.Encoding encoding) { }
-        [System.Security.SecuritySafeCriticalAttribute]
         public StreamWriter(string path, bool append, System.Text.Encoding encoding, int bufferSize) { }
         public virtual bool AutoFlush { get { throw null; } set { } }
         public virtual System.IO.Stream BaseStream { get { throw null; } }
@@ -9882,33 +9880,22 @@ namespace System.IO
         public override void Close() { }
         protected override void Dispose(bool disposing) { }
         public override void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task FlushAsync() { throw null; }
         public override void Write(char value) { }
-        public override void Write(char[] buffer) { }
-        public override void Write(char[] buffer, int index, int count) { }
-        public override void Write(string value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(char[] buffer, int index, int count) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(System.ReadOnlySpan<char> buffer) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void Write(string value) { }
         public override System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(System.ReadOnlySpan<char> value) { }
+        [System.Runtime.CompilerServices.MethodImpl(System.Runtime.CompilerServices.MethodImplOptions.NoInlining)]public override void WriteLine(string value) { }
         public override System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public override System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public override System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     [System.Runtime.InteropServices.ComVisibleAttribute(true)]
@@ -9994,7 +9981,6 @@ namespace System.IO
         public virtual System.Threading.Tasks.Task<string> ReadToEndAsync() { throw null; }
         public static System.IO.TextReader Synchronized(System.IO.TextReader reader) { throw null; }
     }
-    [System.Runtime.InteropServices.ComVisibleAttribute(true)]
     [System.SerializableAttribute]
     public abstract partial class TextWriter : System.MarshalByRefObject, System.IDisposable
     {
@@ -10009,10 +9995,7 @@ namespace System.IO
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
         public virtual void Flush() { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task FlushAsync() { throw null; }
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, Synchronization=true)]
         public static System.IO.TextWriter Synchronized(System.IO.TextWriter writer) { throw null; }
         public virtual void Write(bool value) { }
         public virtual void Write(char value) { }
@@ -10023,6 +10006,7 @@ namespace System.IO
         public virtual void Write(int value) { }
         public virtual void Write(long value) { }
         public virtual void Write(object value) { }
+        public virtual void Write(System.ReadOnlySpan<char> buffer) { }
         public virtual void Write(float value) { }
         public virtual void Write(string value) { }
         public virtual void Write(string format, object arg0) { }
@@ -10033,17 +10017,10 @@ namespace System.IO
         public virtual void Write(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void Write(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteAsync(string value) { throw null; }
         public virtual void WriteLine() { }
         public virtual void WriteLine(bool value) { }
@@ -10055,6 +10032,7 @@ namespace System.IO
         public virtual void WriteLine(int value) { }
         public virtual void WriteLine(long value) { }
         public virtual void WriteLine(object value) { }
+        public virtual void WriteLine(System.ReadOnlySpan<char> buffer) { }
         public virtual void WriteLine(float value) { }
         public virtual void WriteLine(string value) { }
         public virtual void WriteLine(string format, object arg0) { }
@@ -10065,20 +10043,11 @@ namespace System.IO
         public virtual void WriteLine(uint value) { }
         [System.CLSCompliantAttribute(false)]
         public virtual void WriteLine(ulong value) { }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync() { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char value) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public System.Threading.Tasks.Task WriteLineAsync(char[] buffer) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
         public virtual System.Threading.Tasks.Task WriteLineAsync(char[] buffer, int index, int count) { throw null; }
-        [System.Runtime.InteropServices.ComVisibleAttribute(false)]
-        [System.Security.Permissions.HostProtectionAttribute(System.Security.Permissions.SecurityAction.LinkDemand, ExternalThreading=true)]
+        public virtual System.Threading.Tasks.Task WriteLineAsync(System.ReadOnlyMemory<char> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task WriteLineAsync(string value) { throw null; }
     }
     public partial class UnmanagedMemoryAccessor : System.IDisposable