Equality of record with private constructor from another assembly gives MethodAccessException

[ntwilson]

We have a codebase with a record with a private constructor. Code in another assembly will equate instances of the record. If both assemblies are compiled with .net 8.0.3, it will work fine. If both assemblies are compiled with 8.0.4, then you will get a runtime exception

System.MethodAccessException : Attempt by method '\' to access method '\.Equals(\, System.Collections.IEqualityComparer)' failed.

Repro here. You can see the successful run for 8.0.303 and the failed run for 8.0.401 here

Known workarounds

• Use .net 8.0.3
• Make the constructor public

[vzarytovskii]

Duplicate of https://github.com/dotnet/fsharp/issues/17447

It's suggested to use workarounds described there. I don't think we've backported the fix to 8.0.

@KevinRansom should we? We probably should.