IL3050/IL2026 - StringTests, TimeZoneInfoTests fail AOT/trimmer analysis in System.Runtime.IOS.Tests

[pavelsavara]

##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1137,92): error IL3050: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Enum.GetValues(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. It might not be possible to create an array of the enum type at runtime. Use the GetValues<TEnum> overload or the GetValuesAsUnderlyingType method instead.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1137,92): error IL3050: Using member 'System.Enum.GetValues(Type)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. It might not be possible to create an array of the enum type at runtime. Use the GetValues<TEnum> overload or the GetValuesAsUnderlyingType method instead. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2181,17): error IL2026: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream, Object)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. BinaryFormatter serialization is not trim compatible because the type of objects being processed cannot be statically discovered.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2181,17): error IL2026: Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(Stream, Object)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. BinaryFormatter serialization is not trim compatible because the type of objects being processed cannot be statically discovered. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2184,67): error IL2026: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. BinaryFormatter serialization is not trim compatible because the type of objects being processed cannot be statically discovered.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2184,67): error IL2026: Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. BinaryFormatter serialization is not trim compatible because the type of objects being processed cannot be statically discovered. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2184,67): error IL3050: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. BinaryFormatter serialization uses dynamic code generation, the type of objects being processed cannot be statically discovered.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2184,67): error IL3050: Using member 'System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream)' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. BinaryFormatter serialization uses dynamic code generation, the type of objects being processed cannot be statically discovered. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2229,61): error IL2075: (NETCORE_ENGINEERING_TELEMETRY=Build) 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.NonPublicProperties' in call to 'System.Type.GetProperty(String, BindingFlags)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/TimeZoneInfoTests.cs(2229,61): error IL2075: 'this' argument does not satisfy 'DynamicallyAccessedMemberTypes.NonPublicProperties' in call to 'System.Type.GetProperty(String, BindingFlags)'. The return value of method 'System.Object.GetType()' does not have matching annotations. The source value must declare at least the same requirements as those declared on the target location it is assigned to. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1312,43): error IL3050: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Reflection.Emit.DynamicMethod.DynamicMethod(String, Type, Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Creating a DynamicMethod requires dynamic code.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1312,43): error IL3050: Using member 'System.Reflection.Emit.DynamicMethod.DynamicMethod(String, Type, Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Creating a DynamicMethod requires dynamic code. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]
##[error]src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1279,47): error IL3050: (NETCORE_ENGINEERING_TELEMETRY=Build) Using member 'System.Reflection.Emit.DynamicMethod.DynamicMethod(String, Type, Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Creating a DynamicMethod requires dynamic code.
/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/System/StringTests.cs(1279,47): error IL3050: Using member 'System.Reflection.Emit.DynamicMethod.DynamicMethod(String, Type, Type[])' which has 'RequiresDynamicCodeAttribute' can break functionality when AOT compiling. Creating a DynamicMethod requires dynamic code. [/Users/runner/work/1/s/src/libraries/System.Runtime/tests/System.Runtime.Tests/Hybrid/System.Runtime.IOS.Tests.csproj::TargetFramework=net11.0-tvos]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1394339&view=results
Build error leg or test failing: System.Runtime.IOS.Tests

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "error IL3050",
  "BuildRetry": false,
  "ExcludeConsoleLog": true
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1394339
Error message validated: [error IL3050]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/27/2026 9:50:42 AM UTC

Report

Build	Definition	Step Name	Console log	Pull Request
1394339	dotnet/runtime	Build product	Log

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	1	1

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[vitek-karas]

This should be fixed by #127387.