React to APICompat changes enabling reverse APICompat for facades (dotnet/corefx#37375)

* React to APICompat changes enabling reverse APICompat for facades

* Fix UAP and NETFX reverse APICompat issues

* Fix reverse APICompat baseline for allconfigurations build

* Manually update to latest APICompat

* Manually update to latest CoreCLR and fix issues

* Baseline System.Threading.Tasks

* Revert "Manually update to latest CoreCLR and fix issues"

This partially reverts commit dotnet/corefx@ee800617b6.

I'm keeping the baseline changes which will be needed when we get a new update.

* Temporarily baseline DiagnosticCounter API gaps

This can be removed when get a new CoreCLR

That's currently blocked due to regressions in tests.


Commit migrated from 035343743c

eng/references.targets

@@ -1,8 +1,8 @@
 <Project>
   <PropertyGroup>
-    <ContractOutputPath>$(RefPath)</ContractOutputPath>
+    <ContractDependencyPaths>$(RefPath)</ContractDependencyPaths>
-    <FrameworkPathOverride>$(ContractOutputPath)</FrameworkPathOverride>
+    <FrameworkPathOverride>$(RefPath)</FrameworkPathOverride>
-    <AssemblySearchPaths>$(AssemblySearchPaths);$(ContractOutputPath);{RawFileName}</AssemblySearchPaths>
+    <AssemblySearchPaths>$(AssemblySearchPaths);$(RefPath);{RawFileName}</AssemblySearchPaths>
     <!-- Disable RAR from transitively discovering dependencies for References -->
     <_FindDependencies>false</_FindDependencies>
     <!--

eng/resolveContract.targets

@@ -2,7 +2,10 @@
   <PropertyGroup Condition="'$(IsSourceProject)' == 'true'">
     <ContractProject Condition="'$(ContractProject)' == ''">$(SourceDir)/$(MSBuildProjectName)/ref/$(MSBuildProjectName).csproj</ContractProject>
     <HasMatchingContract Condition="'$(HasMatchingContract)' == '' and Exists('$(ContractProject)')">true</HasMatchingContract>
-    <ContractAssemblyPath Condition="'$(ContractAssemblyPath)' == ''">$(ContractOutputPath)/$(MSBuildProjectName).dll</ContractAssemblyPath>
+    <ContractAssemblyPath Condition="'$(ContractAssemblyPath)' == ''">$(RefPath)/$(MSBuildProjectName).dll</ContractAssemblyPath>
+
+    <!-- Disable API compat if the project doesn't have reference assembly -->
+    <RunApiCompat Condition="'$(HasMatchingContract)' != 'true'">false</RunApiCompat>
   </PropertyGroup>
 
   <ItemGroup Condition="'$(HasMatchingContract)' == 'true'">
@@ -17,7 +20,13 @@
   <!-- intentionally empty since we no longer need a target -->
   <Target Name="ResolveMatchingContract" />
 
-  <Target Name="VerifyMatchingContract" AfterTargets="ResolveReferences">
+  <!-- Disable matching ref API compat for aot runtime refencing libs, these have a lot of public API
-    <Error Condition="'$(HasMatchingContract)' == 'true' and !Exists('%(ResolvedMatchingContract.Identity)')" Text="ResolveMatchingContract could not find a matching contract '%(ResolvedMatchingContract.Identity)' not found." />
+         only by implementation and we don't intend to start new API development on AOT -->
+  <Target Name="DisableRunMatchingRefApiCompat" 
+          BeforeTargets="CoreCompile"
+          Condition="'$(TargetsAot)' == 'true' AND '@(ReferenceFromRuntime)' != ''">
+    <PropertyGroup>
+      <RunMatchingRefApiCompat>False</RunMatchingRefApiCompat>
+    </PropertyGroup>
   </Target>
 </Project>

src/libraries/CoreFx.Private.TestUtilities/ref/CoreFx.Private.TestUtilities.cs

@@ -27,6 +27,7 @@ namespace System
         public static void ThrowsAny<TFirstExceptionType, TSecondExceptionType, TThirdExceptionType>(System.Action action) where TFirstExceptionType : System.Exception where TSecondExceptionType : System.Exception where TThirdExceptionType : System.Exception { }
         public static System.Threading.Tasks.Task<T> ThrowsAsync<T>(string paramName, System.Func<System.Threading.Tasks.Task> testCode) where T : System.ArgumentException { throw null; }
         public static void ThrowsIf<T>(bool condition, System.Action action) where T : System.Exception { }
+        public static T Throws<T>(System.Action action) where T : System.Exception { throw null; }
         public static void Throws<T>(System.Action action, string message) where T : System.Exception { }
         public static T Throws<T>(string paramName, System.Action action) where T : System.ArgumentException { throw null; }
         public static T Throws<T>(string paramName, System.Func<object> testCode) where T : System.ArgumentException { throw null; }
@@ -42,13 +43,13 @@ namespace System
         public static bool ClientWebSocketPartialMessagesSupported { get { throw null; } }
         public static bool HasWindowsShell { get { throw null; } }
         public static System.Version ICUVersion { get { throw null; } }
+        public static bool Is32BitProcess { get { throw null; } }
         public static bool IsAlpine { get { throw null; } }
         public static bool IsArgIteratorNotSupported { get { throw null; } }
         public static bool IsArgIteratorSupported { get { throw null; } }
         public static bool IsArm64Process { get { throw null; } }
         public static bool IsArmOrArm64Process { get { throw null; } }
         public static bool IsArmProcess { get { throw null; } }
-        public static bool Is32BitProcess { get { throw null; } }
         public static bool IsCentos6 { get { throw null; } }
         public static bool IsDebian { get { throw null; } }
         public static bool IsDebian8 { get { throw null; } }
@@ -156,6 +157,7 @@ namespace System.IO
     public abstract partial class FileCleanupTestBase : System.IDisposable
     {
         protected FileCleanupTestBase() { }
+        protected static bool IsProcessElevated { get { throw null; } }
         protected string TestDirectory { get { throw null; } }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }

src/libraries/CoreFx.Private.TestUtilities/src/CoreFx.Private.TestUtilities.csproj

@@ -8,6 +8,7 @@
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <NoWarn>$(NoWarn);CS1573</NoWarn>
     <EnablePInvokeAnalyzer>false</EnablePInvokeAnalyzer>
+    <RunMatchingRefApiCompat>false</RunMatchingRefApiCompat>
     <NoWarn Condition="'$(TargetGroup)' == 'netstandard'">$(NoWarn);CS3021</NoWarn>
     <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(TargetGroup)' == 'netstandard'">Test Utilities are not supported on this platform</GeneratePlatformNotSupportedAssemblyMessage>
     <Configurations>netcoreapp-Unix-Debug;netcoreapp-Unix-Release;netcoreapp-Windows_NT-Debug;netcoreapp-Windows_NT-Release;netcoreapp2.0-Unix-Debug;netcoreapp2.0-Unix-Release;netcoreapp2.0-Windows_NT-Debug;netcoreapp2.0-Windows_NT-Release;netfx-Windows_NT-Debug;netfx-Windows_NT-Release;netstandard-Debug;netstandard-Release;uap-Windows_NT-Debug;uap-Windows_NT-Release;uapaot-Windows_NT-Debug;uapaot-Windows_NT-Release</Configurations>

src/libraries/System.AppContext/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,9 @@
+Compat issues with assembly System.AppContext:
+MembersMustExist : Member 'System.AppContext.add_FirstChanceException(System.EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.add_ProcessExit(System.EventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.add_UnhandledException(System.UnhandledExceptionEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_FirstChanceException(System.EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_ProcessExit(System.EventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_UnhandledException(System.UnhandledExceptionEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.SetData(System.String, System.Object)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 7

src/libraries/System.Collections/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,8 @@
+Compat issues with assembly System.Collections:
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.TypeDependencyAttribute' exists on 'System.Collections.Generic.Comparer<T>' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.TypeDependencyAttribute' exists on 'System.Collections.Generic.EqualityComparer<T>' in the implementation but not the reference.
+TypesMustExist : Type 'System.Collections.Generic.SortedDictionary<TKey, TValue>.KeyValuePairComparer' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Collections.Generic.SortedList<TKey, TValue>.KeyList' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Collections.Generic.SortedList<TKey, TValue>.ValueList' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Collections.Generic.TreeSet<T>' does not exist in the reference but it does exist in the implementation.
+Total Issues: 6

src/libraries/System.Diagnostics.Debug/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,3 @@
+Compat issues with assembly System.Diagnostics.Debug:
+MembersMustExist : Member 'System.Diagnostics.Debug.SetProvider(System.Diagnostics.DebugProvider)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 1

src/libraries/System.Diagnostics.Tracing/src/ApiCompatBaseline.netfx.txt

@@ -1,4 +0,0 @@
-Compat issues with assembly System.Diagnostics.Tracing:
-MembersMustExist : Member 'System.Diagnostics.Tracing.EventSource.add_EventCommandExecuted(System.EventHandler<System.Diagnostics.Tracing.EventCommandEventArgs>)' does not exist in the implementation but it does exist in the contract.
-MembersMustExist : Member 'System.Diagnostics.Tracing.EventSource.remove_EventCommandExecuted(System.EventHandler<System.Diagnostics.Tracing.EventCommandEventArgs>)' does not exist in the implementation but it does exist in the contract.
-Total Issues: 2

src/libraries/System.Diagnostics.Tracing/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,9 @@
+Compat issues with assembly System.Diagnostics.Tracing:
+CannotSealType : Type 'System.Diagnostics.Tracing.DiagnosticCounter' is effectively (has a private constructor) sealed in the reference but not sealed in the implementation.
+MembersMustExist : Member 'System.Diagnostics.Tracing.DiagnosticCounter..ctor(System.String, System.Diagnostics.Tracing.EventSource)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Diagnostics.Tracing.DiagnosticCounter.WritePayload(System.Single, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Diagnostics.Tracing.EventCounter.Flush()' does not exist in the reference but it does exist in the implementation.
+CannotMakeTypeAbstract : Type 'System.Diagnostics.Tracing.EventListener' is abstract in the reference but is not abstract in the implementation.
+CannotMakeMoreVisible : Visibility of member 'System.Diagnostics.Tracing.EventListener..ctor()' is 'Family' in the reference but 'Public' in the implementation.
+CannotMakeMoreVisible : Visibility of member 'System.Diagnostics.Tracing.EventListener.EventSourceIndex(System.Diagnostics.Tracing.EventSource)' is 'Family' in the reference but 'Public' in the implementation.
+Total Issues: 7

src/libraries/System.Diagnostics.Tracing/src/MatchingRefApiCompatBaseline.uap.txt

@@ -0,0 +1,8 @@
+Compat issues with assembly System.Diagnostics.Tracing:
+CannotRemoveBaseTypeOrInterface : Type 'System.Diagnostics.Tracing.EventCounter' does not inherit from base type 'System.Diagnostics.Tracing.DiagnosticCounter' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Diagnostics.Tracing.EventCounter.Flush()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Diagnostics.Tracing.EventCounter.WriteMetric(System.Double)' does not exist in the reference but it does exist in the implementation.
+CannotMakeTypeAbstract : Type 'System.Diagnostics.Tracing.EventListener' is abstract in the reference but is not abstract in the implementation.
+CannotMakeMoreVisible : Visibility of member 'System.Diagnostics.Tracing.EventListener..ctor()' is 'Family' in the reference but 'Public' in the implementation.
+CannotMakeMoreVisible : Visibility of member 'System.Diagnostics.Tracing.EventListener.EventSourceIndex(System.Diagnostics.Tracing.EventSource)' is 'Family' in the reference but 'Public' in the implementation.
+Total Issues: 6

src/libraries/System.Linq.Expressions/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,18 @@
+Compat issues with assembly System.Linq.Expressions:
+CannotMakeTypeAbstract : Type 'System.Linq.Expressions.DynamicExpressionVisitor' is abstract in the reference but is not abstract in the implementation.
+CannotMakeMoreVisible : Visibility of member 'System.Linq.Expressions.DynamicExpressionVisitor..ctor()' is 'Family' in the reference but 'Public' in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.ElementInit.ArgumentCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.ElementInit.GetArgument(System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.IndexExpression.ArgumentCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.IndexExpression.GetArgument(System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.InvocationExpression.ArgumentCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.InvocationExpression.GetArgument(System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.MethodCallExpression.ArgumentCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.MethodCallExpression.GetArgument(System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.NewExpression.ArgumentCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Linq.Expressions.NewExpression.GetArgument(System.Int32)' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Linq.Expressions.Interpreter.LightLambda' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.CompilerServices.CallSiteOps' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.CompilerServices.Closure' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.CompilerServices.RuntimeOps' does not exist in the reference but it does exist in the implementation.
+Total Issues: 16

src/libraries/System.Numerics.Vectors/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,8 @@
+Compat issues with assembly System.Numerics.Vectors:
+MembersMustExist : Member 'System.Numerics.Vector<T>..ctor(System.ReadOnlySpan<System.Byte>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Numerics.Vector<T>..ctor(System.ReadOnlySpan<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Numerics.Vector<T>.CopyTo(System.Span<System.Byte>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Numerics.Vector<T>.CopyTo(System.Span<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Numerics.Vector<T>.TryCopyTo(System.Span<System.Byte>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Numerics.Vector<T>.TryCopyTo(System.Span<T>)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 6

src/libraries/System.Reflection.Emit.ILGeneration/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,8 @@
+Compat issues with assembly System.Reflection.Emit.ILGeneration:
+MembersMustExist : Member 'System.Reflection.Emit.ILGenerator.MarkSequencePoint(System.Diagnostics.SymbolStore.ISymbolDocumentWriter, System.Int32, System.Int32, System.Int32, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.LocalBuilder.SetLocalSymInfo(System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.LocalBuilder.SetLocalSymInfo(System.String, System.Int32, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ParameterBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.SignatureHelper.GetMethodSigHelper(System.Reflection.Module, System.Runtime.InteropServices.CallingConvention, System.Type)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.SignatureHelper.GetMethodSigHelper(System.Runtime.InteropServices.CallingConvention, System.Type)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 6

src/libraries/System.Reflection.Emit/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,33 @@
+Compat issues with assembly System.Reflection.Emit:
+MembersMustExist : Member 'System.Reflection.Emit.AssemblyBuilder.DefineDynamicModule(System.String, System.Boolean)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.GetModule()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.Signature.get()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.EnumBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.CreateType()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.TypeToken.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EventBuilder.GetEventToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.FieldBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.GenericTypeParameterBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.GenericTypeParameterBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.GetModule()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.Signature.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.DefineDocument(System.String, System.Guid, System.Guid, System.Guid)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetArrayMethodToken(System.Type, System.String, System.Reflection.CallingConventions, System.Type, System.Type[])' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetConstructorToken(System.Reflection.ConstructorInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetFieldToken(System.Reflection.FieldInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetMethodToken(System.Reflection.MethodInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetModuleHandleImpl()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetSignatureToken(System.Byte[], System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetSignatureToken(System.Reflection.Emit.SignatureHelper)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetStringConstant(System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetTypeToken(System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetTypeToken(System.Type)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.IsTransient()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.PropertyBuilder.PropertyToken.get()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.TypeBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.TypeBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.TypeBuilder.TypeToken.get()' does not exist in the reference but it does exist in the implementation.
+Total Issues: 31

src/libraries/System.Reflection.Emit/src/MatchingRefApiCompatBaseline.uap10.0.16299.txt

@@ -0,0 +1,34 @@
+Compat issues with assembly System.Reflection.Emit:
+MembersMustExist : Member 'System.Reflection.Emit.AssemblyBuilder.DefineDynamicModule(System.String, System.Boolean)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.GetModule()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ConstructorBuilder.Signature.get()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.EnumBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.CreateType()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EnumBuilder.TypeToken.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.EventBuilder.GetEventToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.FieldBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.GenericTypeParameterBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.GenericTypeParameterBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.GetModule()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.GetToken()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.MethodBuilder.Signature.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.DefineDocument(System.String, System.Guid, System.Guid, System.Guid)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetArrayMethodToken(System.Type, System.String, System.Reflection.CallingConventions, System.Type, System.Type[])' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetConstructorToken(System.Reflection.ConstructorInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetFieldToken(System.Reflection.FieldInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetMethodToken(System.Reflection.MethodInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetModuleHandleImpl()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetSignatureToken(System.Byte[], System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetSignatureToken(System.Reflection.Emit.SignatureHelper)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetStringConstant(System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetTypeToken(System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.GetTypeToken(System.Type)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.ModuleBuilder.IsTransient()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.PropertyBuilder.PropertyToken.get()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Reflection.Emit.TypeBuilder' does not inherit from base type 'System.Reflection.TypeInfo' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.TypeBuilder.CreateType()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.TypeBuilder.IsAssignableFrom(System.Reflection.TypeInfo)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Reflection.Emit.TypeBuilder.TypeToken.get()' does not exist in the reference but it does exist in the implementation.
+Total Issues: 32

src/libraries/System.Reflection/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,7 @@
+Compat issues with assembly System.Reflection:
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Reflection.CustomAttributeNamedArgument' in the implementation but not the reference.
+TypeCannotChangeClassification : Type 'System.Reflection.CustomAttributeNamedArgument' is marked as readonly in the implementation so it must also be marked readonly in the reference.
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Reflection.CustomAttributeTypedArgument' in the implementation but not the reference.
+TypeCannotChangeClassification : Type 'System.Reflection.CustomAttributeTypedArgument' is marked as readonly in the implementation so it must also be marked readonly in the reference.
+MembersMustExist : Member 'System.Reflection.Module.GetModuleHandleImpl()' does not exist in the reference but it does exist in the implementation.
+Total Issues: 5

src/libraries/System.Resources.ResourceManager/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,4 @@
+Compat issues with assembly System.Resources.ResourceManager:
+MembersMustExist : Member 'System.String System.Resources.ResourceManager.BaseNameField' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Resources.IResourceReader System.Resources.ResourceSet.Reader' does not exist in the reference but it does exist in the implementation.
+Total Issues: 2

src/libraries/System.Runtime.Extensions/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,7 @@
+Compat issues with assembly System.Runtime.Extensions:
+MembersMustExist : Member 'System.AppDomain.GetThreadPrincipal()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Environment.FailFast(System.String, System.Exception, System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.IO.Path.Join(System.ReadOnlySpan<System.Char>, System.ReadOnlySpan<System.Char>, System.ReadOnlySpan<System.Char>, System.ReadOnlySpan<System.Char>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.IO.Path.Join(System.String, System.String, System.String, System.String)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.IO.Path.Join(System.String[])' does not exist in the reference but it does exist in the implementation.
+Total Issues: 5

src/libraries/System.Runtime.InteropServices.WindowsRuntime/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,8 @@
+Compat issues with assembly System.Runtime.InteropServices.WindowsRuntime:
+CannotRemoveBaseTypeOrInterface : Type 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken' does not implement interface 'System.IEquatable<System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken>' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken..ctor(System.UInt64)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken.Equals(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken.Value.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.WindowsRuntime.EventRegistrationTokenTable<T>.RemoveEventHandler(System.Runtime.InteropServices.WindowsRuntime.EventRegistrationToken, T)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeMarshal.GetUniqueObjectForIUnknownWithoutUnboxing(System.IntPtr)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 6

src/libraries/System.Runtime.InteropServices/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,11 @@
+Compat issues with assembly System.Runtime.InteropServices:
+TypesMustExist : Type 'System.Runtime.InteropServices.AssemblyRegistrationFlags' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.ExporterEventKind' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.IDispatchImplAttribute' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.IDispatchImplType' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.RegistrationClassContext' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.RegistrationConnectionType' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Runtime.InteropServices.SetWin32ContextInIDispatchAttribute' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.InteropServices.UnmanagedFunctionPointerAttribute..ctor()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.InteropServices.ComTypes.IDataObject' in the implementation but not the reference.
+Total Issues: 9

src/libraries/System.Runtime.Intrinsics.Experimental/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,7 @@
+Compat issues with assembly System.Runtime.Intrinsics.Experimental:
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.Arm.Arm64.Aes' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.Arm.Arm64.Base' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.Arm.Arm64.Sha1' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.Arm.Arm64.Sha256' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.Arm.Arm64.Simd' in the implementation but not the reference.
+Total Issues: 5

src/libraries/System.Runtime.Intrinsics/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,17 @@
+Compat issues with assembly System.Runtime.Intrinsics:
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Aes' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Avx' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Avx2' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Bmi1' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Bmi2' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Fma' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Lzcnt' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Pclmulqdq' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Popcnt' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Sse' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Sse2' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Sse3' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Sse41' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Sse42' in the implementation but not the reference.
+CannotRemoveAttribute : Attribute 'System.CLSCompliantAttribute' exists on 'System.Runtime.Intrinsics.X86.Ssse3' in the implementation but not the reference.
+Total Issues: 15

src/libraries/System.Runtime.Loader/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,11 @@
+Compat issues with assembly System.Runtime.Loader:
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_AssemblyLoad(System.AssemblyLoadEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_AssemblyResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_ResourceResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.add_TypeResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.GetLoadedAssemblies()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_AssemblyLoad(System.AssemblyLoadEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_AssemblyResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_ResourceResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Loader.AssemblyLoadContext.remove_TypeResolve(System.ResolveEventHandler)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 9

src/libraries/System.Runtime.Serialization.Formatters/src/MatchingRefApiCompatBaseline.txt

@@ -1,3 +1,9 @@
 # Exposed publicly only in implementation for serialization compat
 TypesMustExist : Type 'System.Runtime.Serialization.SerializationEventHandler' does not exist in the reference but it does exist in the implementation.
 TypesMustExist : Type 'System.Runtime.Serialization.TypeLoadExceptionHolder' does not exist in the reference but it does exist in the implementation.
+
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.DeserializationInProgress.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.StartDeserialization()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.ThrowIfDeserializationInProgress()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.ThrowIfDeserializationInProgress(System.String, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.UpdateValue(System.String, System.Object, System.Type)' does not exist in the reference but it does exist in the implementation.

src/libraries/System.Runtime.WindowsRuntime/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,5 @@
+Compat issues with assembly System.Runtime.WindowsRuntime:
+CannotRemoveBaseTypeOrInterface : Type 'System.Runtime.InteropServices.WindowsRuntime.WindowsRuntimeBuffer' does not implement interface 'Windows.Storage.Streams.IBuffer' in the reference but it does in the implementation.
+TypesMustExist : Type 'System.Threading.DispatcherQueueHandler' does not exist in the reference but it does exist in the implementation.
+TypesMustExist : Type 'System.Threading.DispatcherQueuePriority' does not exist in the reference but it does exist in the implementation.
+Total Issues: 3

src/libraries/System.Runtime/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,28 @@
+Compat issues with assembly System.Runtime:
+MembersMustExist : Member 'System.AppContext.add_FirstChanceException(System.EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.add_ProcessExit(System.EventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.add_UnhandledException(System.UnhandledExceptionEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_FirstChanceException(System.EventHandler<System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_ProcessExit(System.EventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.remove_UnhandledException(System.UnhandledExceptionEventHandler)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.AppContext.SetData(System.String, System.Object)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.WeakReference..ctor()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.AddRange(System.Collections.Generic.IEnumerable<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.InsertItemsRange(System.Int32, System.Collections.Generic.IEnumerable<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.InsertRange(System.Int32, System.Collections.Generic.IEnumerable<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.RemoveItemsRange(System.Int32, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.RemoveRange(System.Int32, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.ReplaceItemsRange(System.Int32, System.Int32, System.Collections.Generic.IEnumerable<T>)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Collections.ObjectModel.Collection<T>.ReplaceRange(System.Int32, System.Int32, System.Collections.Generic.IEnumerable<T>)' does not exist in the reference but it does exist in the implementation.
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Reflection.CustomAttributeNamedArgument' in the implementation but not the reference.
+TypeCannotChangeClassification : Type 'System.Reflection.CustomAttributeNamedArgument' is marked as readonly in the implementation so it must also be marked readonly in the reference.
+CannotRemoveAttribute : Attribute 'System.Runtime.CompilerServices.IsReadOnlyAttribute' exists on 'System.Reflection.CustomAttributeTypedArgument' in the implementation but not the reference.
+TypeCannotChangeClassification : Type 'System.Reflection.CustomAttributeTypedArgument' is marked as readonly in the implementation so it must also be marked readonly in the reference.
+MembersMustExist : Member 'System.Reflection.Module.GetModuleHandleImpl()' does not exist in the reference but it does exist in the implementation.
+CannotRemoveBaseTypeOrInterface : Type 'System.Runtime.Serialization.DeserializationBlockedException' does not inherit from base type 'System.Runtime.Serialization.SerializationException' in the reference but it does in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.DeserializationInProgress.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.StartDeserialization()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.ThrowIfDeserializationInProgress()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.ThrowIfDeserializationInProgress(System.String, System.Int32)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Runtime.Serialization.SerializationInfo.UpdateValue(System.String, System.Object, System.Type)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 26

src/libraries/System.Threading.Tasks/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,5 @@
+Compat issues with assembly System.Threading.Tasks:
+MembersMustExist : Member 'System.Threading.Tasks.TaskExtensions.ConfigureAwait(System.IAsyncDisposable, System.Boolean)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Threading.Tasks.TaskExtensions.ConfigureAwait<T>(System.Collections.Generic.IAsyncEnumerable<T>, System.Boolean)' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Threading.Tasks.TaskExtensions.WithCancellation<T>(System.Collections.Generic.IAsyncEnumerable<T>, System.Threading.CancellationToken)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 3

src/libraries/System.Threading.ThreadPool/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,5 @@
+Compat issues with assembly System.Threading.ThreadPool:
+MembersMustExist : Member 'System.Threading.ThreadPool.CompletedWorkItemCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Threading.ThreadPool.PendingWorkItemCount.get()' does not exist in the reference but it does exist in the implementation.
+MembersMustExist : Member 'System.Threading.ThreadPool.ThreadCount.get()' does not exist in the reference but it does exist in the implementation.
+Total Issues: 3

src/libraries/System.Threading/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,3 @@
+Compat issues with assembly System.Threading:
+MembersMustExist : Member 'System.Threading.Monitor.LockContentionCount.get()' does not exist in the reference but it does exist in the implementation.
+Total Issues: 1

src/libraries/System.Utf8String.Experimental/src/MatchingRefApiCompatBaseline.txt

@@ -0,0 +1,3 @@
+Compat issues with assembly System.Utf8String.Experimental:
+MembersMustExist : Member 'System.Utf8String.Substring(System.Index)' does not exist in the reference but it does exist in the implementation.
+Total Issues: 1