Mono inconsistency in error case when using ExplicitThis when defining constructor

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#113,839 opened on Mar 24, 2025 1 comment 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty: 2/5
Estimated time: 1-3 hours
Newbie friendliness: 50/100

Issue type: Bug
Clarity: Clearly specified
Activity status: Stale
Tech stack: csharp
Domain: testing

Research direction

Search the runtime test sources for System.Reflection.Emit.Tests.TypeBuilderDefineConstructor.DefineConstructor_ExplicitThisCallingConventionsForInstanceMethod_ThrowsTypeLoadExceptionOnCreation(). Start by running this test on Mono and CoreCLR to confirm the differing outcomes. Add the [ActiveIssue] annotation as described, then rerun the relevant test to verify the expected failure is tracked on Mono.

Written by the indexing model from the issue text.

Description

area-VM-meta-mono

This is a minor inconsistency for Mono compared to CoreClr found while adding tests for ExplicitThis calling convention, and this issue created mainly to add the [ActiveIssue] to test System.Reflection.Emit.Tests.TypeBuilderDefineConstructor.DefineConstructor_ExplicitThisCallingConventionsForInstanceMethod_ThrowsTypeLoadExceptionOnCreation()

That test does not fail on Mono, but on CoreClr fails with an expected TypeLoadException:

Unhandled exception. System.TypeLoadException: The signature is incorrect.
   at System.Reflection.Emit.RuntimeTypeBuilder.TermCreateClass(QCallModule module, Int32 tk, ObjectHandleOnStack type)
   at System.Reflection.Emit.RuntimeTypeBuilder.TermCreateClass(QCallModule module, Int32 tk, ObjectHandleOnStack type)
   at System.Reflection.Emit.RuntimeTypeBuilder.CreateTypeNoLock() in C:\git\rfp2\src\coreclr\System.Private.CoreLib\src\System\Reflection\Emit\RuntimeTypeBuilder.cs:line 1658
   at System.Reflection.Emit.RuntimeTypeBuilder.CreateTypeInfoImpl() in C:\git\rfp2\src\coreclr\System.Private.CoreLib\src\System\Reflection\Emit\RuntimeTypeBuilder.cs:line 1483
   at System.Reflection.Emit.RuntimeTypeBuilder.CreateTypeInfoCore() in C:\git\rfp2\src\coreclr\System.Private.CoreLib\src\System\Reflection\Emit\RuntimeTypeBuilder.cs:line 1473
   at System.Reflection.Emit.TypeBuilder.CreateTypeInfo() in C:\git\rfp2\src\libraries\System.Private.CoreLib\src\System\Reflection\Emit\TypeBuilder.cs:line 42
   at System.Reflection.Emit.TypeBuilder.CreateType() in C:\git\rfp2\src\libraries\System.Private.CoreLib\src\System\Reflection\Emit\TypeBuilder.cs:line 38

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