Add analyzer+codefix for unsafe methods->RequiresUnsafe by agocke · Pull Request #125195 · dotnet/runtime

agocke · 2026-03-04T23:22:19Z

Adds an analyzer+codefix that warns on methods with an unsafe modifier, but are not marked [RequiresUnsafe].

Also adds [RequiresUnsafe] to all unsafe methods in System.Private.Corelib.

Add a new DiagnosticAnalyzer (UnsafeMethodMissingRequiresUnsafeAnalyzer) that warns when a method, constructor, or local function has the 'unsafe' modifier but is not annotated with [RequiresUnsafe]. Add a matching CodeFixProvider that adds the [RequiresUnsafe] attribute to the flagged declaration. Both are #if DEBUG guarded and enabled via the existing EnableUnsafeAnalyzer MSBuild property. New diagnostic: IL5004 (UnsafeMethodMissingRequiresUnsafe) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot

Pull request overview

Adds a DEBUG-only Roslyn analyzer + code fix in the ILLink tooling to enforce that unsafe-modified methods are annotated with [RequiresUnsafe], and then applies [RequiresUnsafe] broadly across existing unsafe APIs (primarily in System.Private.CoreLib and related shared sources).

Changes:

Introduces a new diagnostic ID + resources and a new analyzer for unsafe methods missing [RequiresUnsafe].
Updates RequiresUnsafeAnalyzer to use a shared attribute-name constant.
Adds [RequiresUnsafe] annotations across many unsafe members throughout CoreLib and shared interop / common sources.

Reviewed changes

Copilot reviewed 281 out of 283 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/tools/illink/src/ILLink.Shared/SharedStrings.resx	Adds title/message strings for the new diagnostic.
src/tools/illink/src/ILLink.Shared/DiagnosticId.cs	Adds `UnsafeMethodMissingRequiresUnsafe = 5004`.
src/tools/illink/src/ILLink.RoslynAnalyzer/UnsafeMethodMissingRequiresUnsafeAnalyzer.cs	New analyzer that reports when `unsafe` methods/ctors/local functions lack `[RequiresUnsafe]` (DEBUG-only).
src/tools/illink/src/ILLink.RoslynAnalyzer/RequiresUnsafeAnalyzer.cs	Refactors attribute-name constant used by unsafe analyzers.
src/tools/illink/src/ILLink.CodeFix/Resources.resx	Adds code fix title for adding `[RequiresUnsafe]` to unsafe methods.
src/libraries/System.Private.CoreLib/src/System/UIntPtr.cs	Adds `[RequiresUnsafe]` to `unsafe` ctor and pointer conversion.
src/libraries/System.Private.CoreLib/src/System/UInt128.cs	Adds `[RequiresUnsafe]` on an `unsafe` local helper.
src/libraries/System.Private.CoreLib/src/System/TimeZoneInfo.FullGlobalizationData.cs	Adds `using System.Diagnostics.CodeAnalysis;` and `[RequiresUnsafe]` to `unsafe` helpers.
src/libraries/System.Private.CoreLib/src/System/TimeZoneInfo.FullGlobalizationData.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ICU helpers.
src/libraries/System.Private.CoreLib/src/System/Threading/Win32ThreadPoolNativeOverlapped.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` allocation paths.
src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolBoundHandle.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolBoundHandle.Portable.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` portable core implementations.
src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPool.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` thread pool APIs.
src/libraries/System.Private.CoreLib/src/System/Threading/Thread.cs	Adds `[RequiresUnsafe]` to an `unsafe` stub method.
src/libraries/System.Private.CoreLib/src/System/Threading/Tasks/Task.cs	Adds `[RequiresUnsafe]` to an `unsafe` generic API.
src/libraries/System.Private.CoreLib/src/System/Threading/PreAllocatedOverlapped.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and final release path.
src/libraries/System.Private.CoreLib/src/System/Threading/PreAllocatedOverlapped.Portable.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helper.
src/libraries/System.Private.CoreLib/src/System/Threading/NamedMutex.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` shared-memory helpers.
src/libraries/System.Private.CoreLib/src/System/Threading/Interlocked.cs	Adds `[RequiresUnsafe]` to several `unsafe` generic overloads.
src/libraries/System.Private.CoreLib/src/System/Threading/Condition.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` debug assertions.
src/libraries/System.Private.CoreLib/src/System/Threading/Backoff.cs	Adds `[RequiresUnsafe]` to an `unsafe` helper.
src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf8Utility.cs	Adds `using` + `[RequiresUnsafe]` to an `unsafe` UTF-8 helper.
src/libraries/System.Private.CoreLib/src/System/Text/Unicode/Utf8.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` transcode methods.
src/libraries/System.Private.CoreLib/src/System/Text/UTF8Encoding.Sealed.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` small-input fast paths.
src/libraries/System.Private.CoreLib/src/System/Text/StringBuilder.cs	Adds `[RequiresUnsafe]` to `unsafe` pointer overload.
src/libraries/System.Private.CoreLib/src/System/Text/Latin1Utility.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` Latin-1 scanners.
src/libraries/System.Private.CoreLib/src/System/Text/Latin1Encoding.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` overrides.
src/libraries/System.Private.CoreLib/src/System/Text/Encoding.Internal.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` encoding internals.
src/libraries/System.Private.CoreLib/src/System/Text/EncoderReplacementFallback.cs	Adds `[RequiresUnsafe]` to `unsafe` reset.
src/libraries/System.Private.CoreLib/src/System/Text/EncoderNLS.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` overloads.
src/libraries/System.Private.CoreLib/src/System/Text/EncoderLatin1BestFitFallback.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` reset.
src/libraries/System.Private.CoreLib/src/System/Text/EncoderFallback.cs	Adds `[RequiresUnsafe]` to `unsafe` internal fallback helpers.
src/libraries/System.Private.CoreLib/src/System/Text/Encoder.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` entry points.
src/libraries/System.Private.CoreLib/src/System/Text/DecoderReplacementFallback.cs	Adds `[RequiresUnsafe]` to `unsafe` reset/fallback.
src/libraries/System.Private.CoreLib/src/System/Text/DecoderNLS.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` overloads.
src/libraries/System.Private.CoreLib/src/System/Text/DecoderFallback.cs	Adds `[RequiresUnsafe]` to `unsafe` internal fallback helpers.
src/libraries/System.Private.CoreLib/src/System/Text/Decoder.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` entry points.
src/libraries/System.Private.CoreLib/src/System/Text/Ascii.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` core helper.
src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Utility.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ASCII scanning helpers.
src/libraries/System.Private.CoreLib/src/System/Text/Ascii.Transcoding.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` transcode APIs.
src/libraries/System.Private.CoreLib/src/System/Text/Ascii.CaseConversion.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` casing helpers.
src/libraries/System.Private.CoreLib/src/System/Text/ASCIIEncoding.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` overrides.
src/libraries/System.Private.CoreLib/src/System/String.Comparison.cs	Adds `[RequiresUnsafe]` to several `unsafe` hashing helpers.
src/libraries/System.Private.CoreLib/src/System/StartupHookProvider.cs	Adds `[RequiresUnsafe]` to `unsafe` startup hook call paths.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helpers.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.T.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` generic helpers.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Packed.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` packed helpers.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Char.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` char helpers.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.ByteMemOps.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` memmove paths.
src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Byte.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` byte helpers.
src/libraries/System.Private.CoreLib/src/System/Span.cs	Adds `using` + `[RequiresUnsafe]` to pointer ctor and `unsafe Clear()`.
src/libraries/System.Private.CoreLib/src/System/Security/SecureString.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and span acquisition.
src/libraries/System.Private.CoreLib/src/System/SearchValues/ProbabilisticMap.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` probabilistic helpers.
src/libraries/System.Private.CoreLib/src/System/SearchValues/IndexOfAnyAsciiSearcher.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` bitmap helpers.
src/libraries/System.Private.CoreLib/src/System/SearchValues/Any5SearchValues.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and method.
src/libraries/System.Private.CoreLib/src/System/SearchValues/Any4SearchValues.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and method.
src/libraries/System.Private.CoreLib/src/System/SearchValues/Any3SearchValues.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and method.
src/libraries/System.Private.CoreLib/src/System/SearchValues/Any2SearchValues.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and method.
src/libraries/System.Private.CoreLib/src/System/SearchValues/Any1SearchValues.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor and method.
src/libraries/System.Private.CoreLib/src/System/Runtime/Loader/AssemblyLoadContext.cs	Adds `[RequiresUnsafe]` to `unsafe` unmanaged entry points.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/X86Base.cs	Adds `[RequiresUnsafe]` to `unsafe` CPUID helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Sse3.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` load helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Bmi2.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` MULX helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Avx512DQ.cs	Adds `[RequiresUnsafe]` to several `unsafe` broadcast helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/X86/Avx10v2.cs	Adds `[RequiresUnsafe]` to `unsafe` store helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector64.cs	Adds `using` + `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector512.cs	Adds `using` + `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector256.cs	Adds `using` + `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector128.cs	Adds `using` + `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/TypeMapLazyDictionary.cs	Adds `[RequiresUnsafe]` to `unsafe` QCall/callback paths.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/ReferenceTrackerHost.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` host APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/PosixSignalRegistration.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` initialization.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/PinnedGCHandle.T.cs	Adds `[RequiresUnsafe]` to `unsafe` address accessor.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/ObjectiveC/ObjectiveCMarshal.PlatformNotSupported.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` API signature.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/NativeLibrary.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` symbol lookup.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/NativeLibrary.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` symbol lookup.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshalling/ComVariant.cs	Adds `[RequiresUnsafe]` to several `unsafe` APIs.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/Marshal.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ANSI conversion helpers.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/GCHandleExtensions.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` address accessors.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/GCHandle.cs	Adds `[RequiresUnsafe]` to `unsafe` handle validation helper.
src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/ComAwareWeakReference.ComWrappers.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` callback init.
src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/RuntimeHelpers.cs	Adds `using` + `[RequiresUnsafe]` to an `unsafe` intrinsic.
src/libraries/System.Private.CoreLib/src/System/Resources/ResourceReader.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` internal helpers.
src/libraries/System.Private.CoreLib/src/System/Resources/FastResourceComparer.cs	Adds `[RequiresUnsafe]` to `unsafe` compare helpers.
src/libraries/System.Private.CoreLib/src/System/Reflection/MethodInvoker.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` invoke paths.
src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` invoke paths.
src/libraries/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.Constructor.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor-invoke paths.
src/libraries/System.Private.CoreLib/src/System/Reflection/ConstructorInvoker.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` invoke paths.
src/libraries/System.Private.CoreLib/src/System/ReadOnlySpan.cs	Adds `using` + `[RequiresUnsafe]` to pointer ctor.
src/libraries/System.Private.CoreLib/src/System/ReadOnlyMemory.cs	Adds `[RequiresUnsafe]` to `unsafe` pinning.
src/libraries/System.Private.CoreLib/src/System/Random.Xoshiro256StarStarImpl.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` RNG impl.
src/libraries/System.Private.CoreLib/src/System/Numerics/Vector4.cs	Adds `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Numerics/Vector3.cs	Adds `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Numerics/Vector2.cs	Adds `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Numerics/Vector.cs	Adds `using` + `[RequiresUnsafe]` to pointer load APIs.
src/libraries/System.Private.CoreLib/src/System/Numerics/Matrix4x4.Impl.cs	Adds `[RequiresUnsafe]` to an `unsafe` helper.
src/libraries/System.Private.CoreLib/src/System/Numerics/BFloat16.cs	Adds `[RequiresUnsafe]` to `unsafe` rounding helpers.
src/libraries/System.Private.CoreLib/src/System/Number.Parsing.cs	Adds `[RequiresUnsafe]` to `unsafe` number parsing helpers.
src/libraries/System.Private.CoreLib/src/System/Number.Formatting.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` format helpers.
src/libraries/System.Private.CoreLib/src/System/Memory.cs	Adds `[RequiresUnsafe]` to `unsafe` pinning.
src/libraries/System.Private.CoreLib/src/System/MathF.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` truncate helper.
src/libraries/System.Private.CoreLib/src/System/Math.cs	Adds `[RequiresUnsafe]` to `unsafe` BigMul/Truncate helpers.
src/libraries/System.Private.CoreLib/src/System/Marvin.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` seed generation.
src/libraries/System.Private.CoreLib/src/System/IntPtr.cs	Adds `[RequiresUnsafe]` to pointer ctor and conversion.
src/libraries/System.Private.CoreLib/src/System/IO/UnmanagedMemoryStream.cs	Adds `using` + `[RequiresUnsafe]` to pointer-based ctors.
src/libraries/System.Private.CoreLib/src/System/IO/StreamWriter.cs	Adds `[RequiresUnsafe]` to an `unsafe` span writer.
src/libraries/System.Private.CoreLib/src/System/IO/RandomAccess.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` file ops.
src/libraries/System.Private.CoreLib/src/System/IO/PersistedFiles.Unix.cs	Adds `[RequiresUnsafe]` to `unsafe` passwd helper.
src/libraries/System.Private.CoreLib/src/System/IO/Path.cs	Adds `[RequiresUnsafe]` to `unsafe` random filename helpers.
src/libraries/System.Private.CoreLib/src/System/IO/Path.Unix.cs	Adds `[RequiresUnsafe]` to `unsafe` temp filename helper.
src/libraries/System.Private.CoreLib/src/System/IO/FileSystemInfo.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` init helper.
src/libraries/System.Private.CoreLib/src/System/IO/FileSystem.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` timestamp setters.
src/libraries/System.Private.CoreLib/src/System/IO/FileStatus.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` timestamp core helper.
src/libraries/System.Private.CoreLib/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` enumeration core.
src/libraries/System.Private.CoreLib/src/System/IO/Directory.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` temp dir helper.
src/libraries/System.Private.CoreLib/src/System/IO/BinaryReader.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` reading overloads.
src/libraries/System.Private.CoreLib/src/System/HashCode.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` seed generation.
src/libraries/System.Private.CoreLib/src/System/Guid.cs	Adds `[RequiresUnsafe]` to `unsafe` formatting helpers.
src/libraries/System.Private.CoreLib/src/System/Guid.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` guid generation.
src/libraries/System.Private.CoreLib/src/System/Globalization/TimeSpanFormat.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` formatter.
src/libraries/System.Private.CoreLib/src/System/Globalization/TextInfo.cs	Adds `using` + `[RequiresUnsafe]` to multiple `unsafe` casing helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/TextInfo.Nls.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` NLS casing helper.
src/libraries/System.Private.CoreLib/src/System/Globalization/TextInfo.Icu.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ICU casing helper.
src/libraries/System.Private.CoreLib/src/System/Globalization/OrdinalCasing.Icu.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` search helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Nls.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` NLS normalization helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/Normalization.Icu.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ICU normalization helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/InvariantModeCasing.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` casing helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/DateTimeFormat.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` formatting helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/CultureData.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` region helper.
src/libraries/System.Private.CoreLib/src/System/Globalization/CultureData.Nls.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` NLS helpers/callbacks.
src/libraries/System.Private.CoreLib/src/System/Globalization/CultureData.Icu.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` ICU helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/CompareInfo.Utf8.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` UTF-8 compare helper.
src/libraries/System.Private.CoreLib/src/System/Globalization/CompareInfo.Nls.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` NLS compare helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/CompareInfo.Icu.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ICU compare helpers.
src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Nls.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` NLS helpers/callback.
src/libraries/System.Private.CoreLib/src/System/Globalization/CalendarData.Icu.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ICU helpers.
src/libraries/System.Private.CoreLib/src/System/Environment.Variables.Windows.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` env var enumeration.
src/libraries/System.Private.CoreLib/src/System/Enum.EnumInfo.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` cloning helper.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/XplatEventLogger.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` QCall helpers.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/TraceLogging/SimpleTypeInfos.cs	Adds `[RequiresUnsafe]` to an `unsafe` helper.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/NativeRuntimeEventSource.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` event processing.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/NativeRuntimeEventSource.Threading.NativeSinks.cs	Adds `[RequiresUnsafe]` to `unsafe` IO event helpers.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/FrameworkEventSource.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` WriteEvent helpers.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventProvider.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ETW encoding/write paths.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeMetadataGenerator.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` metadata generation/write helpers.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventProvider.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` callback/enable paths.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipeEventDispatcher.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` dispatch loop.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipe.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` enable path.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/EventPipe.Internal.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` QCall P/Invokes.
src/libraries/System.Private.CoreLib/src/System/Diagnostics/Tracing/ActivityTracker.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` GUID path helpers.
src/libraries/System.Private.CoreLib/src/System/Decimal.DecCalc.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` arithmetic helpers.
src/libraries/System.Private.CoreLib/src/System/Collections/Generic/RandomizedStringEqualityComparer.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctor.
src/libraries/System.Private.CoreLib/src/System/Collections/Generic/ArraySortHelper.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` sort helper.
src/libraries/System.Private.CoreLib/src/System/Collections/BitArray.cs	Adds `using` + `[RequiresUnsafe]` to an `unsafe` override.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Utf8Parser/Utf8Parser.Float.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` parse entry points.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Utf8Parser/Utf8Parser.Decimal.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` parse entry point.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Url/Base64UrlEncoder.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` encoder internals.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Url/Base64UrlDecoder.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` vector-load helpers.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64EncoderHelper.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` encode helpers.
src/libraries/System.Private.CoreLib/src/System/Buffers/Text/Base64Helper/Base64DecoderHelper.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` decode helpers.
src/libraries/System.Private.CoreLib/src/System/Buffers/ArrayPoolEventSource.cs	Adds `[RequiresUnsafe]` to `unsafe` ETW event writers.
src/libraries/System.Private.CoreLib/src/System/Buffer.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` MemoryCopy APIs.
src/libraries/System.Private.CoreLib/src/System/BitConverter.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` BFloat16 helpers.
src/libraries/System.Private.CoreLib/src/System/ArgumentNullException.cs	Adds `[RequiresUnsafe]` to pointer overload.
src/libraries/System.Private.CoreLib/src/System/AppContext.cs	Adds `[RequiresUnsafe]` to `unsafe` unmanaged entry point.
src/libraries/System.Private.CoreLib/src/Internal/Runtime/InteropServices/ComponentActivator.cs	Adds `[RequiresUnsafe]` to `unsafe` unmanaged entry points.
src/libraries/System.Private.CoreLib/src/Internal/Console.Unix.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` console writers.
src/libraries/Common/src/System/Number.Parsing.Common.cs	Adds `using` + `[RequiresUnsafe]` to shared `unsafe` parsing helpers.
src/libraries/Common/src/System/Number.Formatting.Common.cs	Adds `using` + `[RequiresUnsafe]` to shared `unsafe` formatting helpers.
src/libraries/Common/src/System/IO/StringParser.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` parsing methods.
src/libraries/Common/src/Interop/Windows/Normaliz/Interop.Normalization.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Windows/Kernel32/Interop.Globalization.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Windows/Kernel32/Interop.GetEnvironmentStrings.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Windows/Kernel32/Interop.FreeEnvironmentStrings.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.Write.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.UTimensat.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.Threading.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.ReadDir.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.Read.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.PosixSignal.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.PWriteV.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.PWrite.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.PReadV.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.PRead.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.MountPoints.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` callback interop.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.MksTemps.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.MkdTemp.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signature.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.Log.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` P/Invoke signatures.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.IsMemberOfGroup.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helpers/PInvoke.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetRandomBytes.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` random APIs.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetPwUid.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` passwd helpers.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetHostName.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` hostname helpers.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetEnviron.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` env interop.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetEnv.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` env interop.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.GetCwd.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` cwd helper.
src/libraries/Common/src/Interop/Unix/System.Native/Interop.Futex.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` futex P/Invokes.
src/libraries/Common/src/Interop/Unix/Interop.Errors.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` strerror helper/PInvoke.
src/libraries/Common/src/Interop/Interop.TimeZoneInfo.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes.
src/libraries/Common/src/Interop/Interop.Normalization.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes.
src/libraries/Common/src/Interop/Interop.Locale.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes.
src/libraries/Common/src/Interop/Interop.Collation.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes.
src/libraries/Common/src/Interop/Interop.Casing.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes.
src/libraries/Common/src/Interop/Interop.Calendar.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` globalization P/Invokes/helpers.
src/coreclr/System.Private.CoreLib/src/System/ValueType.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` overrides and QCalls.
src/coreclr/System.Private.CoreLib/src/System/TypedReference.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` helper.
src/coreclr/System.Private.CoreLib/src/System/Threading/Thread.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` start/QCall.
src/coreclr/System.Private.CoreLib/src/System/Threading/ObjectHeader.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` header helpers.
src/coreclr/System.Private.CoreLib/src/System/Threading/Interlocked.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` intrinsics/internalcalls.
src/coreclr/System.Private.CoreLib/src/System/Text/StringBuilder.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` buffer replacement APIs.
src/coreclr/System.Private.CoreLib/src/System/String.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` fast allocation.
src/coreclr/System.Private.CoreLib/src/System/StartupHookProvider.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` startup entry.
src/coreclr/System.Private.CoreLib/src/System/Runtime/Loader/AssemblyLoadContext.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` internal load.
src/coreclr/System.Private.CoreLib/src/System/Runtime/InteropServices/Java/JavaMarshal.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` init/handles.
src/coreclr/System.Private.CoreLib/src/System/Runtime/InteropServices/ComWrappers.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` impl helpers/QCall.
src/coreclr/System.Private.CoreLib/src/System/Runtime/ExceptionServices/InternalCalls.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` QCall declarations.
src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/VirtualDispatchHelpers.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` QCall.
src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/StaticsHelpers.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` dynamic address helpers.
src/coreclr/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncHelpers.CoreCLR.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` helpers/QCalls.
src/coreclr/System.Private.CoreLib/src/System/Reflection/TypeNameResolver.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` VM helper.
src/coreclr/System.Private.CoreLib/src/System/Reflection/RuntimeAssembly.cs	Adds `[RequiresUnsafe]` to multiple `unsafe` resource/load paths.
src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodInvoker.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctors.
src/coreclr/System.Private.CoreLib/src/System/Reflection/MethodBaseInvoker.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` ctors.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Metadata/MetadataUpdater.cs	Adds `[RequiresUnsafe]` to `unsafe` QCalls.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Metadata/AssemblyExtensions.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` raw metadata access.
src/coreclr/System.Private.CoreLib/src/System/Reflection/MdImport.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` marshal helpers/QCall.
src/coreclr/System.Private.CoreLib/src/System/Reflection/MdConstant.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` constant reader.
src/coreclr/System.Private.CoreLib/src/System/Reflection/LoaderAllocator.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` unmanaged entry point.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Emit/SignatureHelper.cs	Adds `[RequiresUnsafe]` to `unsafe` signature helper.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Emit/RuntimeTypeBuilder.cs	Adds `[RequiresUnsafe]` to `unsafe` constant setting paths.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Emit/RuntimeAssemblyBuilder.cs	Adds `[RequiresUnsafe]` to `unsafe` QCall + helper.
src/coreclr/System.Private.CoreLib/src/System/Reflection/Emit/DynamicILGenerator.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` IL emit helpers.
src/coreclr/System.Private.CoreLib/src/System/Reflection/ConstructorInvoker.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` invoke path.
src/coreclr/System.Private.CoreLib/src/System/Reflection/AssemblyName.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` parsing helpers.
src/coreclr/System.Private.CoreLib/src/System/Object.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` intrinsics.
src/coreclr/System.Private.CoreLib/src/System/MulticastDelegate.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` allocation helper.
src/coreclr/System.Private.CoreLib/src/System/MathF.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helpers/internalcalls.
src/coreclr/System.Private.CoreLib/src/System/Math.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helpers/internalcalls.
src/coreclr/System.Private.CoreLib/src/System/GC.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` finalizer helpers/QCall.
src/coreclr/System.Private.CoreLib/src/System/Environment.CoreCLR.cs	Adds `[RequiresUnsafe]` to `unsafe` argv processing.
src/coreclr/System.Private.CoreLib/src/System/Enum.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` helpers.
src/coreclr/System.Private.CoreLib/src/System/Delegate.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` internalcalls/QCalls.
src/coreclr/System.Private.CoreLib/src/System/Buffer.CoreCLR.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` memcpy helpers.
src/coreclr/System.Private.CoreLib/src/System/ArgIterator.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` APIs (PNSE).
src/coreclr/System.Private.CoreLib/src/Internal/Runtime/InteropServices/InMemoryAssemblyLoader.PlatformNotSupported.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` PNSE stub.
src/coreclr/System.Private.CoreLib/src/Internal/Runtime/InteropServices/ComActivator.PlatformNotSupported.cs	Adds `using` + `[RequiresUnsafe]` to `unsafe` unmanaged entry points.

Copilot · 2026-03-04T23:29:36Z

src/libraries/Common/src/System/Number.Parsing.Common.cs

+        [RequiresUnsafe]
        private static unsafe bool TryParseNumber<TChar>(scoped ref TChar* str, TChar* strEnd, NumberStyles styles, ref NumberBuffer number, NumberFormatInfo info)
            where TChar : unmanaged, IUtfChar<TChar>


[RequiresUnsafe] is applied in a src/libraries/Common/src/... shared source file. RequiresUnsafeAttribute is currently defined as an internal type in System.Private.CoreLib, so any other assembly that compiles this Common file (e.g., System.Runtime.Numerics links it) will fail to compile because it can't reference that internal attribute. Consider moving RequiresUnsafeAttribute into src/libraries/Common/src/System/Diagnostics/CodeAnalysis/ and linking it into all consuming projects (or otherwise conditionally compiling these annotations only for System.Private.CoreLib).

Copilot · 2026-03-04T23:29:36Z

src/libraries/Common/src/Interop/Unix/System.Native/Interop.Read.cs

        [LibraryImport(Libraries.SystemNative, EntryPoint = "SystemNative_Read", SetLastError = true)]
+        [RequiresUnsafe]
        internal static unsafe partial int Read(SafeHandle fd, byte* buffer, int count);
    }


[RequiresUnsafe] is added to a Common Interop source file which is typically compiled into multiple assemblies. Since RequiresUnsafeAttribute is internal to System.Private.CoreLib today, this will break compilation for other assemblies that include this file. Either make the attribute available to all consuming projects (e.g., move it to Common and link it) or guard these annotations so they only compile where the attribute is defined.

Copilot · 2026-03-04T23:29:36Z

src/tools/illink/src/ILLink.RoslynAnalyzer/UnsafeMethodMissingRequiresUnsafeAnalyzer.cs

+    [DiagnosticAnalyzer (LanguageNames.CSharp)]
+    public sealed class UnsafeMethodMissingRequiresUnsafeAnalyzer : DiagnosticAnalyzer
+    {
+        private static readonly DiagnosticDescriptor s_rule = DiagnosticDescriptors.GetDiagnosticDescriptor (DiagnosticId.UnsafeMethodMissingRequiresUnsafe);
+
+        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics => ImmutableArray.Create (s_rule);
+
+        public override void Initialize (AnalysisContext context)
+        {
+            context.EnableConcurrentExecution ();
+            context.ConfigureGeneratedCodeAnalysis (GeneratedCodeAnalysisFlags.None);
+            context.RegisterCompilationStartAction (context => {
+                if (!context.Options.IsMSBuildPropertyValueTrue (MSBuildPropertyOptionNames.EnableUnsafeAnalyzer))


The new analyzer file uses inconsistent spacing in attributes and method invocations (e.g., [DiagnosticAnalyzer (LanguageNames.CSharp)], EnableConcurrentExecution ()) compared to the existing analyzers in this project. This makes the file stand out and may conflict with repo formatting conventions; please align formatting with the surrounding ILLink analyzers.

agocke · 2026-03-05T22:49:24Z

Closing in favor of #125196

agocke and others added 2 commits March 3, 2026 17:04

Mark all methods with unsafe as

d1b7f84

Copilot AI review requested due to automatic review settings March 4, 2026 23:22

github-actions bot added the area-System.Runtime.InteropServices label Mar 4, 2026

Merge branch 'main' into add-unsafe-missing-requires-unsafe-analyzer

d3ac776

Copilot started reviewing on behalf of agocke March 4, 2026 23:23 View session

dotnet-policy-service bot added the linkable-framework Issues associated with delivering a linker friendly framework label Mar 4, 2026

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Copilot AI reviewed Mar 4, 2026

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Copilot AI mentioned this pull request Mar 4, 2026

Add analyzer+codefix for unsafe methods missing [RequiresUnsafe] #125196

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agocke closed this Mar 5, 2026

agocke deleted the add-unsafe-missing-requires-unsafe-analyzer branch March 5, 2026 22:49

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Add analyzer+codefix for unsafe methods->RequiresUnsafe#125195

Add analyzer+codefix for unsafe methods->RequiresUnsafe#125195
agocke wants to merge 3 commits intodotnet:mainfrom
agocke:add-unsafe-missing-requires-unsafe-analyzer

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