ReflectionTypeLoadException when static field of readonly record struct references other struct

[Sebazzz]

Description

Note: this is fixed in .NET 10 bug exists in .NET 8.0.415 and .NET 9.0.307

When a readonly record struct static field references another readonly record struct the types won't load and a ReflectionTypeLoadException is thrown when attempting to use Assembly.GetTypes.

Reproduction Steps

Files and contents:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net9.0</TargetFramework><!-- or net8.0 -->
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

</Project>

// See https://aka.ms/new-console-template for more information
Console.WriteLine("Listing types in current assembly:");

foreach (var type in typeof(Program).Assembly.GetTypes())
{
    Console.WriteLine(type.FullName);
}

namespace TypeLoadBug;

internal readonly record struct QuestionTrigger(string QuestionId, int AnswerId) {
    public static readonly QuestionTriggerList NoTriggers = default;
}

internal readonly record struct QuestionTriggerList(QuestionTrigger Trigger1, QuestionTrigger Trigger2, QuestionTrigger Trigger3) : IEnumerable<QuestionTrigger> {
    public IEnumerator<QuestionTrigger> GetEnumerator() {
        if (this.Trigger1 != default) yield return this.Trigger1;
        if (this.Trigger2 != default) yield return this.Trigger2;
        if (this.Trigger3 != default) yield return this.Trigger3;
    }

    System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() => this.GetEnumerator();
    
    public static QuestionTriggerList Create((string? QuestionId, int? AnswerId) trigger1, (string? QuestionId, int? AnswerId) trigger2, (string? QuestionId, int? AnswerId) trigger3) {
        return new QuestionTriggerList(
            trigger1.QuestionId is not null && trigger1.AnswerId is not null ? new QuestionTrigger(trigger1.QuestionId, trigger1.AnswerId.Value) : default,
            trigger2.QuestionId is not null && trigger2.AnswerId is not null ? new QuestionTrigger(trigger2.QuestionId, trigger2.AnswerId.Value) : default,
            trigger3.QuestionId is not null && trigger3.AnswerId is not null ? new QuestionTrigger(trigger3.QuestionId, trigger3.AnswerId.Value) : default
        );
    }
    
}

Expected behavior

Output:

Listing types in current assembly:
Program
TypeLoadBug.QuestionTrigger
TypeLoadBug.QuestionTriggerList
TypeLoadBug.QuestionTriggerList+<GetEnumerator>d__13

Actual behavior

Output:

Listing types in current assembly:
Unhandled exception. System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types.
Could not load type 'TypeLoadBug.QuestionTrigger' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'TypeLoadBug.QuestionTriggerList' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Could not load type 'TypeLoadBug.QuestionTrigger' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
   at System.Reflection.RuntimeModule.GetDefinedTypes()
   at System.Reflection.RuntimeModule.GetTypes()
   at Program.<Main>$(String[] args) in D:\ProjectsTemp\TypeLoadBug\Program.cs:line 4
System.TypeLoadException: Could not load type 'TypeLoadBug.QuestionTrigger' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
System.TypeLoadException: Could not load type 'TypeLoadBug.QuestionTriggerList' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
System.TypeLoadException: Could not load type 'TypeLoadBug.QuestionTrigger' from assembly 'TypeLoadBug, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
                                  

Regression?

Unknown

Known Workarounds

Move the static readonly field to the struct of its type.

Configuration

.NET on Windows, happens on 8.0.415 and 9.0.307 SDKs

Other information

No response

[MihuBot]

I'm a bot. Here are possible related and/or duplicate issues (I may be wrong):

• System.TypeLoadException When Interface Type Contains Static Field/Property for Derived Struct Type #104511
• TypeLoadException when using a struct containing a static ImmutableArray<T> field/auto-property #100077
• Struct with self-referencing ImmutableArray static field causes TypeLoadException #104519
• System.TypeLoadException from static field #100950
• A TypeLoadException may occur when referencing type information of a structure #116546