Bug 8364 - mono-2-10: class.c:1767, condition `class->image->dynamic || field->offset > 0' not met
Summary: mono-2-10: class.c:1767, condition `class->image->dynamic || field->offset > ...
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2012-11-13 04:07 UTC by David Schmitt
Modified: 2012-11-13 07:14 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

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Description David Schmitt 2012-11-13 04:07:43 UTC
When using nullable references to generic structs, the dmcs compiler hits a bug in the runtime:

[mono-2-10] jenkins@jenkins:~/tmp/empty-struct$ dmcs /t:library empty-struct.cs
* Assertion at class.c:1767, condition `class->image->dynamic || field->offset > 0' not met


  at (wrapper managed-to-native) System.Reflection.Emit.TypeBuilder.create_runtime_class (System.Reflection.Emit.TypeBuilder,System.Reflection.Emit.TypeBuilder) <0xffffffff>
  at System.Reflection.Emit.TypeBuilder.CreateType () <0x0043f>
  at Mono.CSharp.TypeContainer.CloseType () <0x001c3>
  at Mono.CSharp.ModuleContainer.CloseType () <0x00072>
  at Mono.CSharp.Driver.Compile () <0x00535>
  at Mono.CSharp.Driver.Main (string[]) <0x000c3>
  at (wrapper runtime-invoke) <Module>.runtime_invoke_int_object (object,intptr,intptr,intptr) <0xffffffff>

The repro case is very simple:

public class Test {
        public EmptyStruct<string>? field;

public struct EmptyStruct<T> { }

The error vanishes if the Nullable is removed. It compiles without problems under MS.NET. It doesn't happen on mono 3.0.
Comment 1 Marek Safar 2012-11-13 07:14:39 UTC
Closing as fixed in 3.0