Use LangVersion=Preview (#48747)

Author: jjonescz

Directory.Build.props

@@ -31,7 +31,7 @@
     <SdkSrcRoot>$([MSBuild]::NormalizeDirectory('$(MSBuildThisFileDirectory)', 'src'))</SdkSrcRoot>
     <PackageProjectUrl>https://github.com/dotnet/sdk</PackageProjectUrl>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <LangVersion>Latest</LangVersion>
+    <LangVersion>Preview</LangVersion>
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
     <DebugSymbols>true</DebugSymbols>
     <!-- Default to all packages generating a corresponding symbol package -->

src/Common/Polyfills.cs

@@ -0,0 +1,11 @@
+namespace System.Linq
+{
+    public static class CustomEnumerableExtensions
+    {
+#if NET10_0_OR_GREATER
+        public static IEnumerable<T> Reverse<T>(T[] array) => Enumerable.Reverse(array);
+#else
+        public static IEnumerable<T> Reverse<T>(this T[] array) => Enumerable.Reverse(array);
+#endif
+    }
+}

src/Microsoft.DotNet.TemplateLocator/Microsoft.DotNet.TemplateLocator.csproj

@@ -35,6 +35,7 @@
     <Compile Include="..\Resolvers\Microsoft.NET.Sdk.WorkloadManifestReader\**\*.cs" LinkBase="Microsoft.NET.Sdk.WorkloadManifestReader" />
     <Compile Include="..\Resolvers\Microsoft.DotNet.MSBuildSdkResolver\FXVersion.cs" LinkBase="Microsoft.DotNet.SdkResolver" />
     <Compile Include="$(RepoRoot)src\Common\EnvironmentVariableNames.cs" LinkBase="Common" />
+    <Compile Include="$(RepoRoot)src\Common\Polyfills.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadFileBasedInstall.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadSetVersion.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Cli\dotnet\Commands\Workload\InstallStateContents.cs" LinkBase="Cli" />

src/Resolvers/Microsoft.DotNet.MSBuildSdkResolver/Microsoft.DotNet.MSBuildSdkResolver.csproj

@@ -59,6 +59,7 @@
 
     <Compile Include="$(RepoRoot)src\Common\EnvironmentVariableNames.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\CliFolderPathCalculatorCore.cs" LinkBase="Common" />
+    <Compile Include="$(RepoRoot)src\Common\Polyfills.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadFileBasedInstall.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadSetVersion.cs" LinkBase="Common" />
   </ItemGroup>

src/Resolvers/Microsoft.NET.Sdk.WorkloadManifestReader/Microsoft.NET.Sdk.WorkloadManifestReader.csproj

@@ -10,6 +10,7 @@
     <EmbeddedResource Update="**\*.resx" GenerateSource="true" Namespace="Microsoft.NET.Sdk.Localization" />
     <Compile Include="..\Microsoft.DotNet.MSBuildSdkResolver\FXVersion.cs" />
     <Compile Include="$(RepoRoot)src\Common\EnvironmentVariableNames.cs" LinkBase="Common" />
+    <Compile Include="$(RepoRoot)src\Common\Polyfills.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadFileBasedInstall.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadSetVersion.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Cli\dotnet\Commands\Workload\InstallStateContents.cs" LinkBase="Cli" />

src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj

@@ -99,6 +99,7 @@
     <Compile Include="..\..\Resolvers\Microsoft.DotNet.MSBuildSdkResolver\FXVersion.cs" LinkBase="WorkloadManifestReader" />
     <Compile Include="$(RepoRoot)src\Common\EnvironmentVariableNames.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\CliFolderPathCalculatorCore.cs" LinkBase="Common" />
+    <Compile Include="$(RepoRoot)src\Common\Polyfills.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadFileBasedInstall.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Common\WorkloadSetVersion.cs" LinkBase="Common" />
     <Compile Include="$(RepoRoot)src\Cli\dotnet\Commands\Workload\InstallStateContents.cs" LinkBase="Cli" />

test/Microsoft.NET.TestFramework/Microsoft.NET.TestFramework.csproj

@@ -62,6 +62,7 @@
 
   <ItemGroup>
     <Compile Include="**\*.cs" Exclude="$(GlobalExclude)" />
+    <Compile Include="$(RepoRoot)src\Common\Polyfills.cs" LinkBase="Common" />
   </ItemGroup>
 
   <ItemGroup>