dotnet · abonie · Feb 25, 2025 · Feb 6, 2025 · Feb 7, 2025 · Feb 8, 2025
diff --git a/.config/dotnet-tools.json b/.config/dotnet-tools.json
@@ -59,4 +59,4 @@
       "rollForward": false
     }
   }
-}
+}
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
@@ -1,7 +1,7 @@
 // For format details, see https://aka.ms/vscode-remote/devcontainer.json or this file's README at:
 {
     "name": "F#",
-    "image": "mcr.microsoft.com/dotnet/sdk:9.0.102",
+    "image": "mcr.microsoft.com/dotnet/sdk:9.0.200",
     "features": {
         "ghcr.io/devcontainers/features/common-utils:2.5.2": {},
         "ghcr.io/devcontainers/features/git:1.3.2": {},

diff --git a/.fantomasignore b/.fantomasignore
@@ -41,7 +41,14 @@ src/Compiler/Checking/TypeHierarchy.fs
 src/Compiler/Checking/TypeRelations.fs
 
 # nullness-related problems
+src/Compiler/Utilities/lib.fsi
+src/Compiler/Utilities/Cancellable.fsi
+src/FSharp.Core/tasks.fsi
+src/FSharp.Core/tasks.fs
+src/FSharp.Core/resumable.fs
 src/Compiler/DependencyManager/DependencyProvider.fs
+src/FSharp.Core/fslib-extra-pervasives.fs
+src/FSharp.Core/fslib-extra-pervasives.fsi
 
 # Incorrectly formatted: https://github.com/dotnet/fsharp/pull/14645/commits/49443a67ea8a17670c8a7c80c8bdf91f82231e91 or https://github.com/fsprojects/fantomas/issues/2733
 # This CompilerImports.fs behavior is not fixed yet, following up in  https://github.com/fsprojects/fantomas/issues/2733
@@ -125,6 +132,8 @@ src/Compiler/Driver/GraphChecking/Graph.fsi
 src/Compiler/Driver/GraphChecking/Graph.fs
 
 src/FSharp.Compiler.LanguageServer/Common/LifecycleManager.fs
+src/Compiler/DependencyManager/NativeDllResolveHandler.fsi
+src/Compiler/DependencyManager/AssemblyResolveHandler.fsi
 
 # Fantomas limitations on implementation files  (to investigate)
 

diff --git a/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md b/docs/release-notes/.FSharp.Compiler.Service/9.0.300.md
@@ -1,23 +1,34 @@
 ### Fixed
+* Fix classification of `nameof` in `nameof<'T>`, `match … with nameof ident -> …`. ([Issue #10026](https://github.com/dotnet/fsharp/issues/10026), [PR #18300](https://github.com/dotnet/fsharp/pull/18300))
 * Fix Realsig+ generates nested closures with incorrect Generic  ([Issue #17797](https://github.com/dotnet/fsharp/issues/17797), [PR #17877](https://github.com/dotnet/fsharp/pull/17877))
 * Fix optimizer internal error for records with static fields  ([Issue #18165](https://github.com/dotnet/fsharp/issues/18165), [PR #18280](https://github.com/dotnet/fsharp/pull/18280))
 * Fix nullness warning with flexible types  ([Issue #18056](https://github.com/dotnet/fsharp/issues/18056), [PR #18266](https://github.com/dotnet/fsharp/pull/18266))
+* Allow first branches of match and if expressions to return nullable results  ([Issue #18015](https://github.com/dotnet/fsharp/issues/18015), [PR #18322](https://github.com/dotnet/fsharp/pull/18322))
 * Fix internal error when missing measure attribute in an unsolved measure typar. ([Issue #7491](https://github.com/dotnet/fsharp/issues/7491), [PR #18234](https://github.com/dotnet/fsharp/pull/18234)==
 * Set `Cancellable.token` from async computation ([Issue #18235](https://github.com/dotnet/fsharp/issues/18235), [PR #18238](https://github.com/dotnet/fsharp/pull/18238))
 * Fix missing nullness warning when static upcast dropped nullness ([Issue #18232](https://github.com/dotnet/fsharp/issues/18232), [PR #18261](https://github.com/dotnet/fsharp/pull/18261))
 * Cancellable: only cancel on OCE with own token ([PR #18277](https://github.com/dotnet/fsharp/pull/18277))
 * Cancellable: set token in more places ([PR #18283](https://github.com/dotnet/fsharp/pull/18283))
+* Cancellable: fix leaking cancellation token ([PR #18295](https://github.com/dotnet/fsharp/pull/18295))
+* Fix NRE when accessing nullable fields of types within their equals/hash/compare methods ([PR #18296](https://github.com/dotnet/fsharp/pull/18296))
+* Fix nullness warning for overrides of generic code with nullable type instance ([Issue #17988](https://github.com/dotnet/fsharp/issues/17988), [PR #18337](https://github.com/dotnet/fsharp/pull/18337))
 
 ### Added
 * Added missing type constraints in FCS. ([PR #18241](https://github.com/dotnet/fsharp/pull/18241))
 * The 'use' keyword can be used on IDisposable|null without nullness warnings ([PR #18262](https://github.com/dotnet/fsharp/pull/18262))
+* Add support for C# `Experimental` attribute. ([PR #18253](https://github.com/dotnet/fsharp/pull/18253))
+* Nullness warnings are issued for signature<>implementation conformance ([PR #18186](https://github.com/dotnet/fsharp/pull/18186))
 * Symbols: Add FSharpAssembly.IsFSharp ([PR #18290](https://github.com/dotnet/fsharp/pull/18290))
+* Type parameter constraint `null` in generic code will now automatically imply `not struct` ([Issue #18320](https://github.com/dotnet/fsharp/issues/18320), [PR #18323](https://github.com/dotnet/fsharp/pull/18323))
 
 ### Changed
 
 * FSharpCheckFileResults.ProjectContext.ProjectOptions will not be available when using the experimental Transparent Compiler feature. ([PR #18205](https://github.com/dotnet/fsharp/pull/18205))
 * Update `Obsolete` attribute checking to account for `DiagnosticId` and `UrlFormat` properties. ([PR #18224](https://github.com/dotnet/fsharp/pull/18224))
 * Remove `Cancellable.UsingToken` from tests ([PR #18276](https://github.com/dotnet/fsharp/pull/18276))
+* Added nullability annotations to `.Using` builder method for `async`, `task` and compiler-internal builders ([PR #18292](https://github.com/dotnet/fsharp/pull/18292))
+* Warn when `unit` is passed to an `obj`-typed argument  ([PR #18330](https://github.com/dotnet/fsharp/pull/18330))
+* Warning for "useless null handling" works with piped syntax constructs now ([PR #18331](https://github.com/dotnet/fsharp/pull/18331))
 
 ### Breaking Changes
-* Struct unions with overlapping fields now generate mappings needed for reading via reflection ([Issue #18121](https://github.com/dotnet/fsharp/issues/17797), [PR #18274](https://github.com/dotnet/fsharp/pull/17877))
+* Struct unions with overlapping fields now generate mappings needed for reading via reflection ([Issue #18121](https://github.com/dotnet/fsharp/issues/17797), [PR #18274](https://github.com/dotnet/fsharp/pull/17877))
diff --git a/docs/release-notes/.FSharp.Core/9.0.101.md b/docs/release-notes/.FSharp.Core/9.0.101.md
@@ -0,0 +1,17 @@
+## FSharp.Core 9.0.101 did not change compared to version 9.0.100. Below are the changes for FSharp.Core 9.0.100
+
+### Fixed
+* Struct UnionCase doesn't seem to be a valid target for the DefaultAugmentationAttribute ([Issue #17499](https://github.com/dotnet/fsharp/issues/17499), [PR #17502](https://github.com/dotnet/fsharp/pull/17502))
+
+### Added
+
+* Enable C# collection expression support for F# lists & sets. ([Language suggestion #1355](https://github.com/fsharp/fslang-suggestions/issues/1355), [RFC FS-1145 (PR#776)](https://github.com/fsharp/fslang-design/pull/776), [PR #17359](https://github.com/dotnet/fsharp/pull/17359))
+* Add module functions for converting between `'T option` and `'T voption`. ([PR #17436](https://github.com/dotnet/fsharp/pull/17436))
+
+### Changed
+* Change compiler default setting realsig+ when building assemblies ([Issue #17384](https://github.com/dotnet/fsharp/issues/17384), [PR #17378](https://github.com/dotnet/fsharp/pull/17385))
+* Change compiler default setting for compressedMetadata ([Issue #17379](https://github.com/dotnet/fsharp/issues/17379), [PR #17383](https://github.com/dotnet/fsharp/pull/17383))
+* Enable FSharp 9.0 Language Version ([Issue #17497](https://github.com/dotnet/fsharp/issues/17438)), [PR](https://github.com/dotnet/fsharp/pull/17500)))
+* Struct UnionCase doesn't seem to be a valid target for the DefaultAugmentationAttribute ([Issue #17499](https://github.com/dotnet/fsharp/issues/17499), [PR #17502](https://github.com/dotnet/fsharp/pull/17502))
+### Breaking Changes
+
diff --git a/docs/release-notes/.FSharp.Core/9.0.300.md b/docs/release-notes/.FSharp.Core/9.0.300.md
@@ -1,8 +1,9 @@
 ### Fixed
 
 ### Added
+* Added nullability annotations to `.Using` builder method for `async` and `task` builders ([PR #18292](https://github.com/dotnet/fsharp/pull/18292))
 
 ### Changed
 
 ### Breaking Changes
-* Struct unions with overlapping fields now generate mappings needed for reading via reflection ([Issue #18121](https://github.com/dotnet/fsharp/issues/17797), [PR #18274](https://github.com/dotnet/fsharp/pull/17877)). Previous versions of FSharp.Core returned incomplete mapping between fields and cases, these older fslib versions will now report an exception.
+* Struct unions with overlapping fields now generate mappings needed for reading via reflection ([Issue #18121](https://github.com/dotnet/fsharp/issues/17797), [PR #18274](https://github.com/dotnet/fsharp/pull/18274)). Previous versions of FSharp.Core returned incomplete mapping between fields and cases, these older fslib versions will now report an exception.
diff --git a/docs/release-notes/.Language/preview.md b/docs/release-notes/.Language/preview.md
@@ -4,6 +4,7 @@
 * Deprecate places where `seq` can be omitted. ([Language suggestion #1033](https://github.com/fsharp/fslang-suggestions/issues/1033), [PR #17772](https://github.com/dotnet/fsharp/pull/17772))
 * Added type conversions cache, only enabled for compiler runs ([PR#17668](https://github.com/dotnet/fsharp/pull/17668))
 * Support ValueOption + Struct attribute as optional parameter for methods ([Language suggestion #1136](https://github.com/fsharp/fslang-suggestions/issues/1136), [PR #18098](https://github.com/dotnet/fsharp/pull/18098))
+* Warn when `unit` is passed to an `obj`-typed argument  ([PR #18330](https://github.com/dotnet/fsharp/pull/18330))
 
 ### Fixed
 

diff --git a/eng/DotNetBuild.props b/eng/DotNetBuild.props
@@ -12,8 +12,7 @@
     the cloned source in the inner build.
   -->
   <Target Name="ConfigureInnerBuildArg"
-          BeforeTargets="GetSourceBuildCommandConfiguration"
-          Condition="'$(DotNetBuildSourceOnly)' == 'true'">
+          BeforeTargets="GetSourceBuildCommandConfiguration">
     <PropertyGroup>
       <InnerBuildArgs>$(InnerBuildArgs) /p:Projects="$(InnerSourceBuildRepoRoot)\Microsoft.FSharp.Compiler.sln"</InnerBuildArgs>
     </PropertyGroup>

diff --git a/eng/Version.Details.xml b/eng/Version.Details.xml
@@ -42,14 +42,14 @@
     </Dependency>
   </ProductDependencies>
   <ToolsetDependencies>
-    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="9.0.0-beta.25077.4">
+    <Dependency Name="Microsoft.DotNet.Arcade.Sdk" Version="9.0.0-beta.25111.5">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>bac7e1caea791275b7c3ccb4cb75fd6a04a26618</Sha>
+      <Sha>5da211e1c42254cb35e7ef3d5a8428fb24853169</Sha>
     </Dependency>
     <!-- Intermediate is necessary for source build. -->
-    <Dependency Name="Microsoft.SourceBuild.Intermediate.arcade" Version="9.0.0-beta.25077.4">
+    <Dependency Name="Microsoft.SourceBuild.Intermediate.arcade" Version="9.0.0-beta.25111.5">
       <Uri>https://github.com/dotnet/arcade</Uri>
-      <Sha>bac7e1caea791275b7c3ccb4cb75fd6a04a26618</Sha>
+      <Sha>5da211e1c42254cb35e7ef3d5a8428fb24853169</Sha>
       <SourceBuild RepoName="arcade" ManagedOnly="true" />
     </Dependency>
     <Dependency Name="optimization.windows_nt-x64.MIBC.Runtime" Version="1.0.0-prerelease.24462.2">

diff --git a/eng/Versions.props b/eng/Versions.props
@@ -37,7 +37,7 @@
     <FSharpLibrariesChangelogVersion>$(FSMajorVersion).$(FSMinorVersion).$(FSBuildVersion)</FSharpLibrariesChangelogVersion>
     <!-- -->
     <!-- The current published nuget package -->
-    <FSharpCoreShippedPackageVersionValue>9.0.101</FSharpCoreShippedPackageVersionValue>
+    <FSharpCoreShippedPackageVersionValue>9.0.201</FSharpCoreShippedPackageVersionValue>
     <!-- -->
     <!-- The pattern for specifying the preview package -->
     <FSharpCorePreviewPackageVersionValue>$(FSCorePackageVersionValue)-$(PreReleaseVersionLabel).*</FSharpCorePreviewPackageVersionValue>
@@ -87,7 +87,6 @@
     <SystemReflectionMetadataVersion>$(SystemPackageVersionVersion)</SystemReflectionMetadataVersion>
     <SystemRuntimeCompilerServicesUnsafeVersion>6.1.0</SystemRuntimeCompilerServicesUnsafeVersion>
     <SystemThreadingTasksDataflow>$(SystemPackageVersionVersion)</SystemThreadingTasksDataflow>
-    <SystemValueTupleVersion>4.5.0</SystemValueTupleVersion>
     <MicrosoftDiaSymReaderPortablePdbVersion>1.6.0</MicrosoftDiaSymReaderPortablePdbVersion>
     <!-- Versions for package groups -->
     <RoslynVersion>4.11.0-2.24264.2</RoslynVersion>

diff --git a/global.json b/global.json
@@ -1,10 +1,10 @@
 {
   "sdk": {
-    "version": "9.0.102",
+    "version": "9.0.200",
     "allowPrerelease": true
   },
   "tools": {
-    "dotnet": "9.0.102",
+    "dotnet": "9.0.200",
     "vs": {
       "version": "17.8",
       "components": [
@@ -17,7 +17,7 @@
     "perl": "5.38.2.2"
   },
   "msbuild-sdks": {
-    "Microsoft.DotNet.Arcade.Sdk": "9.0.0-beta.25077.4",
+    "Microsoft.DotNet.Arcade.Sdk": "9.0.0-beta.25111.5",
     "Microsoft.DotNet.Helix.Sdk": "8.0.0-beta.23255.2"
   }
 }
diff --git a/src/Compiler/AbstractIL/ilreflect.fs b/src/Compiler/AbstractIL/ilreflect.fs
@@ -2548,7 +2548,7 @@ let EmitDynamicAssemblyFragment
             ignore (typB.InvokeMemberAndLog(methodName, BindingFlags.InvokeMethod ||| BindingFlags.Public ||| BindingFlags.Static, [||]))
             None
         with :? TargetInvocationException as exn ->
-            Some exn.InnerException
+            Option.ofObj exn.InnerException
 
     let emEnv, entryPts = envPopEntryPts emEnv
     let execs = List.map execEntryPtFun entryPts
-Original file line number
+Diff line change
@@ Expand Up / @@ -59,4 +59,4 @@ @@
           "rollForward": false
         }
       }
-    }
+    }