Reference Meziantou.Polyfill and remove local definitions it provides

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/CompilerFeatureRequiredAttribute.cs

@@ -1,33 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-// ReSharper disable once CheckNamespace
-namespace System.Runtime.CompilerServices;
-
-/// <summary>
-///     Indicates that compiler support for a particular feature is required for the location where this attribute is
-///     applied.
-/// </summary>
-[AttributeUsage (AttributeTargets.All, AllowMultiple = true, Inherited = false)]
-internal sealed class CompilerFeatureRequiredAttribute(string featureName) : Attribute
-{
-    /// <summary>
-    ///     The <see cref="FeatureName"/> used for the ref structs C# feature.
-    /// </summary>
-    public const string RefStructs = nameof (RefStructs);
-
-    /// <summary>
-    ///     The <see cref="FeatureName"/> used for the required members C# feature.
-    /// </summary>
-    public const string RequiredMembers = nameof (RequiredMembers);
-
-    /// <summary>
-    ///     The name of the compiler feature.
-    /// </summary>
-    public string FeatureName { get; } = featureName;
-    /// <summary>
-    ///     If true, the compiler can choose to allow access to the location where this attribute is applied if it does not
-    ///     understand <see cref="FeatureName"/>.
-    /// </summary>
-    public bool IsOptional { get; init; }
-}

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/IsExternalInit.cs

@@ -1,18 +0,0 @@
-using System.ComponentModel;
-using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
-
-// ReSharper disable CheckNamespace
-namespace System.Runtime.CompilerServices;
-
-/// <summary>
-///     Reserved to be used by the compiler for tracking metadata.
-///     This class should not be used by developers in source code.
-/// </summary>
-/// <remarks>
-///     Copied from .net source code, for support of init property accessors in netstandard2.0.
-/// </remarks>
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-[EditorBrowsable (EditorBrowsableState.Never)]
-public static class IsExternalInit;

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/NullableAttributes.cs

@@ -1,208 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-//
-// This file is further modified from the original, for this project,
-// to comply with project style.
-// No changes are made which affect compatibility with the same types from
-// APIs later than netstandard2.0, nor will this file be included in compilations
-// targeted at later APIs.
-//
-// Originally rom https://github.com/dotnet/runtime/blob/ef72b95937703e485fdbbb75f3251fedfd1a0ef9/src/libraries/System.Private.CoreLib/src/System/Diagnostics/CodeAnalysis/NullableAttributes.cs
-
-// ReSharper disable CheckNamespace
-
-// ReSharper disable UnusedAutoPropertyAccessor.Global
-// ReSharper disable UnusedType.Global
-
-namespace System.Diagnostics.CodeAnalysis;
-
-/// <summary>Specifies that null is allowed as an input even if the corresponding type disallows it.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class AllowNullAttribute : Attribute;
-
-/// <summary>Specifies that null is disallowed as an input even if the corresponding type allows it.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class DisallowNullAttribute : Attribute;
-
-/// <summary>Specifies that an output may be null even if the corresponding type disallows it.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class MaybeNullAttribute : Attribute;
-
-/// <summary>
-///     Specifies that an output will not be null even if the corresponding type allows it. Specifies that an input
-///     argument was not null when the call returns.
-/// </summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Field | AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class NotNullAttribute : Attribute;
-
-/// <summary>
-///     Specifies that when a method returns <see cref="ReturnValue"/>, the parameter may be null even if the corresponding
-///     type disallows it.
-/// </summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Parameter)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class MaybeNullWhenAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with the specified return value condition.</summary>
-    /// <param name="returnValue">
-    ///     The return value condition. If the method returns this value, the associated parameter may be null.
-    /// </param>
-#pragma warning disable IDE0290 // Use primary constructor
-    public MaybeNullWhenAttribute (bool returnValue) { ReturnValue = returnValue; }
-#pragma warning restore IDE0290 // Use primary constructor
-
-    /// <summary>Gets the return value condition.</summary>
-    public bool ReturnValue { get; }
-}
-
-/// <summary>
-///     Specifies that when a method returns <see cref="ReturnValue"/>, the parameter will not be null even if the
-///     corresponding type allows it.
-/// </summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Parameter)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class NotNullWhenAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with the specified return value condition.</summary>
-    /// <param name="returnValue">
-    ///     The return value condition. If the method returns this value, the associated parameter will not be null.
-    /// </param>
-#pragma warning disable IDE0290 // Use primary constructor
-    public NotNullWhenAttribute (bool returnValue) { ReturnValue = returnValue; }
-#pragma warning restore IDE0290 // Use primary constructor
-
-    /// <summary>Gets the return value condition.</summary>
-    public bool ReturnValue { get; }
-}
-
-/// <summary>Specifies that the output will be non-null if the named parameter is non-null.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Parameter | AttributeTargets.Property | AttributeTargets.ReturnValue, AllowMultiple = true)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class NotNullIfNotNullAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with the associated parameter name.</summary>
-    /// <param name="parameterName">
-    ///     The associated parameter name.  The output will be non-null if the argument to the parameter specified is non-null.
-    /// </param>
-#pragma warning disable IDE0290 // Use primary constructor
-    public NotNullIfNotNullAttribute (string parameterName) { ParameterName = parameterName; }
-#pragma warning restore IDE0290 // Use primary constructor
-
-    /// <summary>Gets the associated parameter name.</summary>
-    public string ParameterName { get; }
-}
-
-/// <summary>Applied to a method that will never return under any circumstance.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Method, Inherited = false)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class DoesNotReturnAttribute : Attribute;
-
-/// <summary>Specifies that the method will not return if the associated Boolean parameter is passed the specified value.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Parameter)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class DoesNotReturnIfAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with the specified parameter value.</summary>
-    /// <param name="parameterValue">
-    ///     The condition parameter value. Code after the method will be considered unreachable by diagnostics if the argument
-    ///     to
-    ///     the associated parameter matches this value.
-    /// </param>
-#pragma warning disable IDE0290 // Use primary constructor
-    public DoesNotReturnIfAttribute (bool parameterValue) { ParameterValue = parameterValue; }
-#pragma warning restore IDE0290 // Use primary constructor
-
-    /// <summary>Gets the condition parameter value.</summary>
-    public bool ParameterValue { get; }
-}
-
-/// <summary>
-///     Specifies that the method or property will ensure that the listed field and property members have not-null
-///     values.
-/// </summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class MemberNotNullAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with a field or property member.</summary>
-    /// <param name="member">
-    ///     The field or property member that is promised to be not-null.
-    /// </param>
-    public MemberNotNullAttribute (string member) { Members = [member]; }
-
-    /// <summary>Initializes the attribute with the list of field and property members.</summary>
-    /// <param name="members">
-    ///     The list of field and property members that are promised to be not-null.
-    /// </param>
-    public MemberNotNullAttribute (params string [] members) { Members = members; }
-
-    /// <summary>Gets field or property member names.</summary>
-    public string [] Members { get; }
-}
-
-/// <summary>
-///     Specifies that the method or property will ensure that the listed field and property members have not-null values
-///     when returning with the specified return value condition.
-/// </summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Method | AttributeTargets.Property, Inherited = false, AllowMultiple = true)]
-[ExcludeFromCodeCoverage]
-[DebuggerNonUserCode]
-internal sealed class MemberNotNullWhenAttribute : Attribute
-{
-    /// <summary>Initializes the attribute with the specified return value condition and a field or property member.</summary>
-    /// <param name="returnValue">
-    ///     The return value condition. If the method returns this value, the associated parameter will not be null.
-    /// </param>
-    /// <param name="member">
-    ///     The field or property member that is promised to be not-null.
-    /// </param>
-    public MemberNotNullWhenAttribute (bool returnValue, string member)
-    {
-        ReturnValue = returnValue;
-        Members = [member];
-    }
-
-    /// <summary>Initializes the attribute with the specified return value condition and list of field and property members.</summary>
-    /// <param name="returnValue">
-    ///     The return value condition. If the method returns this value, the associated parameter will not be null.
-    /// </param>
-    /// <param name="members">
-    ///     The list of field and property members that are promised to be not-null.
-    /// </param>
-    public MemberNotNullWhenAttribute (bool returnValue, params string [] members)
-    {
-        ReturnValue = returnValue;
-        Members = members;
-    }
-
-    /// <summary>Gets field or property member names.</summary>
-    public string [] Members { get; }
-
-    /// <summary>Gets the return value condition.</summary>
-    public bool ReturnValue { get; }
-}

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/RequiredMemberAttribute.cs

@@ -1,12 +0,0 @@
-// ReSharper disable CheckNamespace
-// ReSharper disable ConditionalAnnotation
-
-using JetBrains.Annotations;
-
-namespace System.Runtime.CompilerServices;
-
-/// <summary>Polyfill to enable netstandard2.0 assembly to use the required keyword.</summary>
-/// <remarks>Excluded from output assembly via file specified in ApiCompatExcludeAttributesFile element in the project file.</remarks>
-[AttributeUsage (AttributeTargets.Property)]
-[UsedImplicitly]
-public sealed class RequiredMemberAttribute : Attribute;

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/SetsRequiredMembersAttribute.cs

@@ -1,12 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-
-// ReSharper disable once CheckNamespace
-namespace System.Diagnostics.CodeAnalysis;
-
-/// <summary>
-///     Specifies that this constructor sets all required members for the current type, and callers
-///     do not need to set any required members themselves.
-/// </summary>
-[AttributeUsage (AttributeTargets.Constructor)]
-public sealed class SetsRequiredMembersAttribute : Attribute;

Analyzers/Terminal.Gui.Analyzers.Internal/Compatibility/SkipLocalsInitAttribute.cs

@@ -1,14 +0,0 @@
-namespace System.Runtime.CompilerServices;
-
-[AttributeUsage (
-                    AttributeTargets.Class
-                    | AttributeTargets.Constructor
-                    | AttributeTargets.Event
-                    | AttributeTargets.Interface
-                    | AttributeTargets.Method
-                    | AttributeTargets.Module
-                    | AttributeTargets.Property
-                    | AttributeTargets.Struct,
-                    Inherited = false)]
-
-internal sealed class SkipLocalsInitAttribute : Attribute;

Analyzers/Terminal.Gui.Analyzers.Internal/Terminal.Gui.Analyzers.Internal.csproj

@@ -36,15 +36,9 @@
         <!-- Disabling some useless warnings caused by the netstandard2.0 target -->
         <NoWarn>$(NoWarn);nullable;CA1067</NoWarn>
     </PropertyGroup>
-    <ItemGroup>                                                                         
-        <Compile Include="Compatibility/CompilerFeatureRequiredAttribute.cs" />         
-        <Compile Include="Compatibility/IsExternalInit.cs" />                           
-        <Compile Include="Compatibility/IEqualityOperators.cs" />
-        <Compile Include="Compatibility/NullableAttributes.cs" />                         
-        <Compile Include="Compatibility/RequiredMemberAttribute.cs" />                  
-        <Compile Include="Compatibility/SetsRequiredMembersAttribute.cs" />             
+    <ItemGroup>                           
+        <Compile Include="Compatibility/IEqualityOperators.cs" />             
         <Compile Include="Compatibility/NumericExtensions.cs" />
-        <Compile Include="Compatibility/SkipLocalsInitAttribute.cs" />
     </ItemGroup>
 
     <ItemGroup>
@@ -53,17 +47,14 @@
     </ItemGroup>
 
     <ItemGroup>
+        <PackageReference Include="Meziantou.Polyfill" Version="1.0.38" PrivateAssets="all" />
         <PackageReference Include="Microsoft.CodeAnalysis" Version="4.9.2" PrivateAssets="all" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.9.2" PrivateAssets="all" />
         <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.9.2" PrivateAssets="all" />
         <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="8.0.0" PrivateAssets="all" />
         <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="8.0.0" PrivateAssets="all" />
-        <PackageReference Include="Roslynator.Analyzers" Version="4.12.1" PrivateAssets="all">
-            <!--<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>-->
-        </PackageReference>
-        <PackageReference Include="Roslynator.CodeAnalysis.Analyzers" Version="4.12.1" PrivateAssets="all">
-            <!--<IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>-->
-        </PackageReference>
+        <PackageReference Include="Roslynator.Analyzers" Version="4.12.1" PrivateAssets="all" />
+        <PackageReference Include="Roslynator.CodeAnalysis.Analyzers" Version="4.12.1" PrivateAssets="all" />
         <PackageReference Include="Roslynator.CSharp" Version="4.12.1" PrivateAssets="all" />
         <PackageReference Include="System.Numerics.Vectors" Version="4.5.0" PrivateAssets="all" />
         <PackageReference Include="System.Runtime.Extensions" Version="4.3.1" PrivateAssets="all" />