Fix build break.

- We no longer track the Roslyn compiler separate from Arcade. This means we can have the latest C# features earlier when Arcade updates.
- Removed `<LangVersion>` specifications because we can rely on `Latest` everywhere now.

Directory.Build.props

@@ -17,7 +17,7 @@
     Condition=" '$(CI)' != 'true' AND '$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), AspNetCoreSettings.props))' != '' " />
 
   <PropertyGroup Label="Build Settings">
-    <LangVersion>8.0</LangVersion>
+    <LangVersion>Latest</LangVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <StrongNameKeyId>MicrosoftAspNetCore</StrongNameKeyId>
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>

Directory.Build.targets

@@ -26,12 +26,6 @@
       <TargetingPackVersion Condition="'%(TargetFramework)' == '$(DefaultNetCoreTargetFramework)' and '$(IsServicingBuild)' != 'true'">$(MicrosoftNETCoreAppRefPackageVersion)</TargetingPackVersion>
     </KnownFrameworkReference>
 
-    <!-- Track compiler separately from Arcade.-->
-    <PackageReference Include="Microsoft.Net.Compilers.Toolset"
-        Version="$(MicrosoftNetCompilersToolsetPackageVersion)"
-        PrivateAssets="all"
-        IsImplicitlyDefined="true" />
-
     <!-- Remove unneeded reference to AspNetCore.App -->
     <KnownFrameworkReference Remove="Microsoft.AspNetCore.App" />
   </ItemGroup>

eng/Versions.props

@@ -102,7 +102,6 @@
     <!-- Packages from dotnet/roslyn -->
     <MicrosoftCodeAnalysisAnalyzerTestingPackageVersion>$(Tooling_MicrosoftCodeAnalysisTestingVersion)</MicrosoftCodeAnalysisAnalyzerTestingPackageVersion>
     <MicrosoftCodeAnalysisTestingVerifiersXunitPackageVersion>$(Tooling_MicrosoftCodeAnalysisTestingVersion)</MicrosoftCodeAnalysisTestingVerifiersXunitPackageVersion>
-    <MicrosoftNetCompilersToolsetPackageVersion>3.9.0-2.20573.10</MicrosoftNetCompilersToolsetPackageVersion>
     <MicrosoftVisualStudioEditorPackageVersion>$(MicrosoftVisualStudioPackagesVersion)</MicrosoftVisualStudioEditorPackageVersion>
     <MicrosoftVisualStudioLanguagePackageVersion>$(MicrosoftVisualStudioPackagesVersion)</MicrosoftVisualStudioLanguagePackageVersion>
     <MicrosoftVisualStudioLanguageIntellisensePackageVersion>$(MicrosoftVisualStudioPackagesVersion)</MicrosoftVisualStudioLanguageIntellisensePackageVersion>

src/Razor/benchmarks/Microsoft.AspNetCore.Razor.Microbenchmarks/MemoryCacheBenchmark.cs

@@ -1,10 +1,6 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT license. See License.txt in the project root for license information.
 
-using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
 using BenchmarkDotNet.Attributes;
 using Microsoft.AspNetCore.Razor.Language;
 using Microsoft.CodeAnalysis.Razor;

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Microsoft.AspNetCore.Razor.LanguageServer.csproj

@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <LangVersion>Latest</LangVersion>
     <Description>Razor is a markup syntax for adding server-side logic to web pages. This package contains the language server library assets.</Description>
     <EnableApiCheck>false</EnableApiCheck>
     <IsShippingPackage>false</IsShippingPackage>
@@ -11,7 +10,7 @@
   <ItemGroup>
     <!-- Need this reference to avoid 'The C# language is not supported' error during formatting. -->
     <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="$(Tooling_MicrosoftCodeAnalysisCSharpWorkspacesPackageVersion)" />
-    
+
     <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="$(MicrosoftExtensionsConfigurationJsonPackageVersion)" />
     <PackageReference Include="OmniSharp.Extensions.LanguageServer" Version="$(OmniSharpExtensionsLanguageServerPackageVersion)" />
   </ItemGroup>

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Microsoft.CodeAnalysis.Razor.Workspaces.csproj

@@ -6,7 +6,6 @@
     <EnableApiCheck>false</EnableApiCheck>
     <IsShippingPackage>false</IsShippingPackage>
     <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
-    <LangVersion>Latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/Razor/src/Microsoft.VisualStudio.LanguageServerClient.Razor/Microsoft.VisualStudio.LanguageServerClient.Razor.csproj

@@ -6,7 +6,6 @@
     <EnableApiCheck>false</EnableApiCheck>
     <IsShippingPackage>false</IsShippingPackage>
     <ExcludeFromSourceBuild>true</ExcludeFromSourceBuild>
-    <LangVersion>Latest</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

src/Razor/test/testapps/Directory.Build.props

@@ -42,13 +42,6 @@
     <_MvcAssemblyName Include="Microsoft.AspNetCore.Razor.Test.MvcShim.ClassLib" />
   </ItemGroup>
 
-  <ItemGroup Condition="$(BuildingTestAppsIndependently) == false">
-    <PackageReference Include="Microsoft.Net.Compilers.Toolset"
-        Version="$(MicrosoftNetCompilersToolsetPackageVersion)"
-        PrivateAssets="all"
-        IsImplicitlyDefined="true" />
-  </ItemGroup>
-
   <Import Project="After.Directory.Build.props" Condition="Exists('After.Directory.Build.props')" />
 
 </Project>