FreeApophis · Oct 30, 2026
diff --git a/Documentation/src/analyzer-rules/analyzer-rules.md b/Documentation/src/analyzer-rules/analyzer-rules.md
@@ -35,7 +35,7 @@ contains a rule.
 | [λ0004](./λ0004.md) | Error | The `default` literal is wrapped by an implicit conversion |
 | [λ0005](./λ0005.md) | Error | A `null` literal is passed to `Option`, `Result` or `Either` |
 | [λ1009](./λ1009.md) | Error | Do not use `default` to instantiate this type (moved from `Funcky.Analyzers` in 3.7.0) |
-| [λ1010](./λ1010.md) | Error | An option has either zero or one elements (needs Roslyn 4.4, i.e. the .NET 7 SDK or newer) |
+| [λ1010](./λ1010.md) | Error | An option has either zero or one elements |
 
 ## Funcky.Analyzers
 

diff --git a/Funcky.Analyzers/Funcky.Analyzers.CodeFixes/Funcky.Analyzers.CodeFixes.csproj b/Funcky.Analyzers/Funcky.Analyzers.CodeFixes/Funcky.Analyzers.CodeFixes.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <AnalyzerRoslynVersion>4.4.0</AnalyzerRoslynVersion>
+        <AnalyzerRoslynVersion>4.14.0</AnalyzerRoslynVersion>
     </PropertyGroup>
     <ItemGroup>
         <ProjectReference Include="..\Funcky.Analyzers\Funcky.Analyzers.csproj" PrivateAssets="all" />

diff --git a/Funcky.Analyzers/Funcky.Analyzers.Package/Funcky.Analyzers.Package.csproj b/Funcky.Analyzers/Funcky.Analyzers.Package/Funcky.Analyzers.Package.csproj
@@ -12,7 +12,7 @@
     </PropertyGroup>
     <PropertyGroup Label="NuGet Metadata">
         <PackageId>Funcky.Analyzers</PackageId>
-        <VersionPrefix>2.1.0</VersionPrefix>
+        <VersionPrefix>3.0.0</VersionPrefix>
         <Description>Analyzers to guide to the correct usage of Funcky.</Description>
         <PackageTags>funcky, analyzers, roslyn</PackageTags>
         <DevelopmentDependency>true</DevelopmentDependency>

diff --git a/Funcky.Analyzers/Funcky.Analyzers.Package/buildTransitive/Funcky.Analyzers.targets b/Funcky.Analyzers/Funcky.Analyzers.Package/buildTransitive/Funcky.Analyzers.targets
@@ -4,7 +4,7 @@
 			Condition="'$(SupportsRoslynComponentVersioning)' != 'true'"
 			AfterTargets="ResolvePackageDependenciesForBuild;ResolveNuGetPackageAssets">
 		<Warning Code="λ.BUILD.0001"
-				 Text="Funcky.Analyzers requires at least Roslyn 4.4 i.e. Visual Studio 2022 17.4 / .NET SDK 7.0" />
+				 Text="Funcky.Analyzers requires at least Roslyn 4.14 i.e. Visual Studio 2022 17.14 / .NET SDK 9.0.300" />
 		<ItemGroup>
 			<Analyzer Remove="@(Analyzer->WithMetadataValue('NuGetPackageId', 'Funcky.Analyzers'))" />
 		</ItemGroup>

diff --git a/Funcky.Analyzers/Funcky.Analyzers/ExtensionForms/ExtensionMemberSupport.cs b/Funcky.Analyzers/Funcky.Analyzers/ExtensionForms/ExtensionMemberSupport.cs
@@ -31,7 +31,7 @@ public static bool HasStaticMember(INamedTypeSymbol type, string name)
             .OfType<IMethodSymbol>()
             .Any(method => method.IsStatic && !method.IsExtensionMethod);
 
-    /// <summary>The static class an extension member or classic extension method is declared in. Roslyn 4.4 has no notion of
+    /// <summary>The static class an extension member or classic extension method is declared in. Roslyn 4.14 has no notion of
     /// an extension block, so any type nested in a static class is taken for one.</summary>
     public static INamedTypeSymbol? DeclaringClass(ISymbol? symbol)
         => symbol is IMethodSymbol method && (method.ReducedFrom ?? method).ContainingType is { } containingType

diff --git a/Funcky.Analyzers/Funcky.Analyzers/Funcky.Analyzers.csproj b/Funcky.Analyzers/Funcky.Analyzers/Funcky.Analyzers.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <AnalyzerRoslynVersion>4.4.0</AnalyzerRoslynVersion>
+        <AnalyzerRoslynVersion>4.14.0</AnalyzerRoslynVersion>
     </PropertyGroup>
     <Import Project="Funcky.Analyzers.targets" />
 </Project>
diff --git a/Funcky.Analyzers/Funcky.Analyzers/Funcky.Analyzers.targets b/Funcky.Analyzers/Funcky.Analyzers/Funcky.Analyzers.targets
@@ -38,15 +38,5 @@
 	<ItemGroup>
 		<EmbeddedResource Update="Resources.resx" Generator="ResXFileCodeGenerator" LastGenOutput="Resources.Designer.cs" />
 	</ItemGroup>
-	<PropertyGroup Condition="'$(DisableAnalyzerReleaseTracking)' == 'true'">
-		<!-- RS2008: Enable analyzer release tracking -->
-		<NoWarn>$(NoWarn);RS2008</NoWarn>
-	</PropertyGroup>
-	<Target Name="_FunckyRemoveAnalyzerReleasesFiles" BeforeTargets="CoreCompile" Condition="'$(DisableAnalyzerReleaseTracking)' == 'true'">
-		<ItemGroup>
-			<AdditionalFiles Remove="AnalyzerReleases.Shipped.md" />
-			<AdditionalFiles Remove="AnalyzerReleases.Unshipped.md" />
-		</ItemGroup>
-	</Target>
 	<Import Project="..\Funcky.Analyzers.Package\Packing.targets" />
 </Project>
diff --git a/...zers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.Roslyn3.7.csproj b/...zers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.Roslyn3.7.csproj
diff --git a/Funcky.Analyzers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.csproj b/Funcky.Analyzers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.csproj
@@ -1,9 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <AnalyzerRoslynVersion>4.4.0</AnalyzerRoslynVersion>
+        <AnalyzerRoslynVersion>4.14.0</AnalyzerRoslynVersion>
     </PropertyGroup>
-    <ItemGroup>
-        <None Include="Funcky.BuiltinAnalyzers.CodeFixes.Roslyn3.7.csproj" />
-    </ItemGroup>
     <Import Project="Funcky.BuiltinAnalyzers.CodeFixes.targets" />
 </Project>
diff --git a/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.Roslyn3.7.csproj b/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.Roslyn3.7.csproj
diff --git a/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.csproj b/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.csproj
@@ -1,10 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
-        <AnalyzerRoslynVersion>4.4.0</AnalyzerRoslynVersion>
-        <DefineConstants>$(DefineConstants);ROSLYN_4_4_0</DefineConstants>
+        <AnalyzerRoslynVersion>4.14.0</AnalyzerRoslynVersion>
     </PropertyGroup>
-    <ItemGroup>
-        <None Include="Funcky.BuiltinAnalyzers.Roslyn3.7.csproj" />
-    </ItemGroup>
     <Import Project="Funcky.BuiltinAnalyzers.targets" />
 </Project>
diff --git a/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.targets b/Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.targets
@@ -23,15 +23,5 @@
 		<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" PrivateAssets="all" />
 		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" VersionOverride="$(AnalyzerRoslynVersion)" PrivateAssets="all" />
 	</ItemGroup>
-	<PropertyGroup Condition="'$(DisableAnalyzerReleaseTracking)' == 'true'">
-		<!-- RS2008: Enable analyzer release tracking -->
-		<NoWarn>$(NoWarn);RS2008</NoWarn>
-	</PropertyGroup>
-	<Target Name="_FunckyRemoveAnalyzerReleasesFiles" BeforeTargets="CoreCompile" Condition="'$(DisableAnalyzerReleaseTracking)' == 'true'">
-		<ItemGroup>
-			<AdditionalFiles Remove="AnalyzerReleases.Shipped.md" />
-			<AdditionalFiles Remove="AnalyzerReleases.Unshipped.md" />
-		</ItemGroup>
-	</Target>
 	<Import Project="..\Funcky.Analyzers.Package\Packing.targets" />
 </Project>
diff --git a/Funcky.Analyzers/Funcky.BuiltinAnalyzers/OptionListPatternAnalyzer.cs b/Funcky.Analyzers/Funcky.BuiltinAnalyzers/OptionListPatternAnalyzer.cs
@@ -1,4 +1,3 @@
-#if ROSLYN_4_4_0
 using System.Collections.Immutable;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.Diagnostics;
@@ -51,4 +50,3 @@ private static Action<OperationAnalysisContext> AnalyzeListPattern(INamedTypeSym
                 }
             };
 }
-#endif
diff --git a/Funcky.Analyzers/readme.md b/Funcky.Analyzers/readme.md
@@ -29,11 +29,12 @@ where a rule was born: `λ00xx` built-in, `λ10xx` `Funcky.Analyzers`, `λ11xx`
 the documentation is the authority on where a rule lives.
 
 ### Built-in Analyzers and Roslyn Versions
-The built-in analyzers have to load on every SDK that can consume `Funcky`, so their baseline is Roslyn 3.7
-(`Funcky.BuiltinAnalyzers.Roslyn3.7.csproj`). Rules that need newer compiler APIs are guarded with `#if ROSLYN_4_4_0` and
-only ship in the `roslyn4.4` asset (`Funcky.BuiltinAnalyzers.csproj`); the `Funcky` package packs both assets with the
-same `GetAnalyzerPackFiles` mechanism as `Funcky.Analyzers.Package`, and `Funcky/build/Funcky.targets` removes the
-`roslyn4.4` asset on SDKs without analyzer versioning and honours `FunckyDisableBuiltinAnalyzers`.
+The built-in analyzers share the Roslyn 4.14 baseline of `Funcky.Analyzers` since Funcky 4.0.0 (up to 3.8.0 they also
+shipped a `roslyn3.7` asset for the SDKs before .NET 7, with the newer rules behind `#if ROSLYN_4_4_0`). The `Funcky`
+package packs the asset with the same `GetAnalyzerPackFiles` mechanism as `Funcky.Analyzers.Package`, and
+`Funcky/build/Funcky.targets` removes the analyzers on SDKs without analyzer versioning (which would otherwise load
+them and fail) and honours `FunckyDisableBuiltinAnalyzers`. Unlike `Funcky.Analyzers`, the library package does not
+warn about an old SDK: the analyzers are an extra, the library itself keeps working.
 
 ## Roslyn Multi-Targeting
 In order to support newer C# features (which in turn requires an upgrade of the `Microsoft.CodeAnalysis.*` packages)
@@ -49,16 +50,18 @@ can be shipped side by side:
 ```
 ╰─ analyzers
    ╰─ dotnet
-      ╰─ roslyn4.4
+      ╰─ roslyn4.14
          ╰─ cs
             ├─ Funcky.Analyzers.dll
             ╰─ ...
 ```
 
 From the different versions, the highest compatible version is picked. Funcky.Analyzers currently ships a
-single asset for Roslyn 4.4 (Visual Studio 2022 17.4, .NET SDK 7.0.100), the oldest version the analyzers
-need. Up to Funcky.Analyzers 1.4.2 there was a second, untested `roslyn4.0` asset for Visual Studio 2022
-17.0; Funcky.Analyzers 2.0.0 dropped it, as that version is out of support. To add an asset for another Roslyn
+single asset for Roslyn 4.14 (Visual Studio 2022 17.14, .NET SDK 9.0.300), the compiler the .NET 10 SDK era
+starts from. Funcky.Analyzers 2.x shipped a `roslyn4.4` asset (Visual Studio 2022 17.4, .NET SDK 7.0.100); 3.0.0
+raised the baseline together with Funcky 4.0.0, which no longer supports SDKs before .NET 10. Up to
+Funcky.Analyzers 1.4.2 there was a second, untested `roslyn4.0` asset for Visual Studio 2022 17.0; Funcky.Analyzers
+2.0.0 dropped it, as that version is out of support. To add an asset for another Roslyn
 version, add a second project file next to `Funcky.Analyzers.csproj` with a different `AnalyzerRoslynVersion`, reference it
 from the package project with `PackAsAnalyzer`, and guard the sources that need the newer API with a define.
 
@@ -68,9 +71,9 @@ from the package project with `PackAsAnalyzer`, and guard the sources that need
     * The `System.Text.Json` package fixes this by shipping a `.targets` file with their packages that
       catches this case by checking for the `SupportsRoslynComponentVersioning` property
       and manually removing discovered analyzers that are incompatible.
-    * Our analyzers require at least Roslyn 4.4; SDKs without multi-targeting support (before Roslyn 4.0 / .NET 6.0)
+    * Our analyzers require at least Roslyn 4.14; SDKs without multi-targeting support (before Roslyn 4.0 / .NET 6.0)
       would load them anyway, so we ship a `.targets` file that removes all our analyzers and warns the user.
-    * An SDK that supports multi-targeting but is older than Roslyn 4.4 finds no compatible directory and loads
+    * An SDK that supports multi-targeting but is older than Roslyn 4.14 finds no compatible directory and loads
       nothing, without a warning; that cannot be detected from MSBuild.
 * SDKs versions that support multi-targeting also load analyzers
   that are not in a `roslyn*` directory, so to avoid loading analyzers twice

diff --git a/Funcky.SourceGenerator/Funcky.SourceGenerator.csproj b/Funcky.SourceGenerator/Funcky.SourceGenerator.csproj
@@ -11,7 +11,7 @@
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" PrivateAssets="all" />
-        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" VersionOverride="4.12.0" />
+        <PackageReference Include="Microsoft.CodeAnalysis.CSharp" VersionOverride="4.14.0" />
         <PackageReference Include="PolySharp" PrivateAssets="all" />
     </ItemGroup>
     <ItemGroup>

diff --git a/Funcky.slnx b/Funcky.slnx
@@ -6,9 +6,7 @@
     <Project Path="Funcky.Analyzers/Funcky.Analyzers.Test/Funcky.Analyzers.Test.csproj" />
     <Project Path="Funcky.Analyzers/Funcky.Analyzers.Vsix/Funcky.Analyzers.Vsix.csproj" />
     <Project Path="Funcky.Analyzers/Funcky.Analyzers/Funcky.Analyzers.csproj" />
-    <Project Path="Funcky.Analyzers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.Roslyn3.7.csproj" />
     <Project Path="Funcky.Analyzers/Funcky.BuiltinAnalyzers.CodeFixes/Funcky.BuiltinAnalyzers.CodeFixes.csproj" />
-    <Project Path="Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.Roslyn3.7.csproj" />
     <Project Path="Funcky.Analyzers/Funcky.BuiltinAnalyzers/Funcky.BuiltinAnalyzers.csproj" />
   </Folder>
   <Folder Name="/Build Config/">

diff --git a/Funcky/Funcky.csproj b/Funcky/Funcky.csproj
@@ -61,16 +61,13 @@
     <Import Project="..\GlobalUsings.props" />
     <Import Project="..\FrameworkFeatureConstants.props" />
     <Import Project="..\PublicApiAnalyzers.targets" />
-    <!-- The built-in analyzers ship inside this package, one assembly per supported Roslyn version
-         (analyzers/dotnet/roslyn3.7/cs and analyzers/dotnet/roslyn4.4/cs). Analyzers.props already references
-         the Roslyn 4.4 projects so that they run on Funcky itself; here they are additionally marked for packing. -->
+    <!-- The built-in analyzers ship inside this package (analyzers/dotnet/roslyn4.14/cs). Analyzers.props already
+         references the projects so that they run on Funcky itself; here they are additionally marked for packing. -->
     <ItemGroup Label="Built-in analyzers packed into the Funcky package">
         <ProjectReference Update="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers\Funcky.BuiltinAnalyzers.csproj" PackAsAnalyzer="true" />
         <ProjectReference Update="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers.CodeFixes\Funcky.BuiltinAnalyzers.CodeFixes.csproj" PackAsAnalyzer="true" />
         <ProjectReference Include="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers\Funcky.BuiltinAnalyzers.csproj" Condition="'$(FunckyDisableAnalyzers)' == 'true'" ReferenceOutputAssembly="false" PrivateAssets="all" PackAsAnalyzer="true" />
         <ProjectReference Include="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers.CodeFixes\Funcky.BuiltinAnalyzers.CodeFixes.csproj" Condition="'$(FunckyDisableAnalyzers)' == 'true'" ReferenceOutputAssembly="false" PrivateAssets="all" PackAsAnalyzer="true" />
-        <ProjectReference Include="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers\Funcky.BuiltinAnalyzers.Roslyn3.7.csproj" ReferenceOutputAssembly="false" PrivateAssets="all" PackAsAnalyzer="true" />
-        <ProjectReference Include="..\Funcky.Analyzers\Funcky.BuiltinAnalyzers.CodeFixes\Funcky.BuiltinAnalyzers.CodeFixes.Roslyn3.7.csproj" ReferenceOutputAssembly="false" PrivateAssets="all" PackAsAnalyzer="true" />
     </ItemGroup>
     <!-- Adapted from https://github.com/dotnet/runtime/blob/4bd597ffde128555b4ff017e87c60adc2fedd178/eng/packaging.targets#L136,
          the same mechanism Funcky.Analyzers.Package uses. -->

diff --git a/Funcky/build/Funcky.targets b/Funcky/build/Funcky.targets
@@ -8,23 +8,23 @@
     </ItemGroup>
 
     <!-- Built-in analyzers.
-         The Funcky package ships its analyzers once per supported Roslyn version (analyzers/dotnet/roslyn3.7/cs and
-         analyzers/dotnet/roslyn4.4/cs). SDKs that support analyzer versioning (.NET 6 and newer) pick the newest
-         compatible directory on their own. Older SDKs load every analyzer they find, so the targets below keep only
-         the Roslyn 3.7 assets there. Adapted from the targets that System.Text.Json ships. -->
+         The Funcky package ships its analyzers in analyzers/dotnet/roslyn4.14/cs. SDKs that support analyzer
+         versioning (.NET 6 and newer) load the directory only when their compiler is at least Roslyn 4.14
+         (Visual Studio 2022 17.14, .NET SDK 9.0.300). Older SDKs load every analyzer they find, so the target
+         below removes the assets there instead of letting the compiler fail to load them. Adapted from the
+         targets that System.Text.Json ships. -->
     <Target Name="_Funcky_GatherBuiltinAnalyzers">
         <ItemGroup>
             <_FunckyBuiltinAnalyzer Include="@(Analyzer)" Condition="'%(Analyzer.NuGetPackageId)' == 'Funcky'" />
         </ItemGroup>
     </Target>
 
-    <Target Name="_Funcky_BuiltinAnalyzerMultiTargeting"
+    <Target Name="_Funcky_RemoveBuiltinAnalyzersWithoutVersioning"
             Condition="'$(SupportsRoslynComponentVersioning)' != 'true'"
             AfterTargets="ResolvePackageDependenciesForBuild;ResolveNuGetPackageAssets"
             DependsOnTargets="_Funcky_GatherBuiltinAnalyzers">
         <ItemGroup>
-            <Analyzer Remove="@(_FunckyBuiltinAnalyzer)"
-                      Condition="$([System.String]::Copy('%(_FunckyBuiltinAnalyzer.Identity)').IndexOf('roslyn4')) &gt;= 0" />
+            <Analyzer Remove="@(_FunckyBuiltinAnalyzer)" />
         </ItemGroup>
     </Target>
 

diff --git a/SupportPolicy.md b/SupportPolicy.md
@@ -8,6 +8,14 @@ We support the all the actively supported modern Frameworks, .NET Standard 2.1,
 
 * We only remove support for target frameworks on major version changes, to avoid breaking changes for the consumers.
 
+## What SDKs do we support?
+
+The analyzers built into Funcky and the Funcky.Analyzers package are compiled against a fixed Roslyn version. Funcky 4
+targets Roslyn 4.14, the compiler of Visual Studio 2022 17.14 and the .NET SDK 9.0.300, so every .NET 10 SDK and newer
+loads them. Older SDKs skip the analyzers; the library itself has no SDK requirement beyond its target frameworks.
+
+* We only raise the Roslyn baseline on major version changes.
+
 ## Testing
 
 Testing with old frameworks which are not supported anymore is getting painful, we therefore only test with frameworks which are still in active support.

diff --git a/changelog.md b/changelog.md
@@ -13,6 +13,12 @@ Funcky adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 * The `net11.0` asset also wraps the search overloads .NET 11 adds to `string`: `IndexOfOrNone` and `LastIndexOfOrNone`
   for a `char` with a `StringComparison` and a start index or count, and both for a `Rune` in every shape the `char`
   overloads come in.
+* Breaking: the built-in analyzers and Funcky.Analyzers 3.0.0 are built against Roslyn 4.14 and ship a single
+  `roslyn4.14` asset. They load on Visual Studio 2022 17.14 and the .NET SDK 9.0.300 or newer, which covers every
+  .NET 10 SDK. The `roslyn3.7` asset of the built-in analyzers and the `roslyn4.4` asset of Funcky.Analyzers are gone;
+  an older SDK that supports analyzer versioning finds no compatible asset and silently skips the analyzers, and the
+  package targets remove them on SDKs without analyzer versioning (before .NET 6). The library itself keeps working on
+  those SDKs. `λ1010` no longer needs a separate note, it is part of the one asset.
 
 ## Funcky 3.8.0 | Funcky.Async 1.6.0 | Funcky.Xunit 2.3.0 | Funcky.Xunit.v3 1.1.0 | Funcky.Analyzers 2.1.0