MethodAccessException on equality comparison of a type private to module

[iminashi]

Something that has worked previously now fails with a MethodAccessException when using SDK 9.0.100.

Repro steps

Calling a public function that does an equality comparison on a type that is private to the module.

module Module =
    type private DU = ABC | YYZ

    let publicFunction () : bool =
        ABC = YYZ

Module.publicFunction () |> printfn "%b"

Expected behavior

false is printed.

Actual behavior

Unhandled exception. System.MethodAccessException: Attempt by method 'Program+Module.publicFunction()' to access method 'Program+Module+DU.Equals(DU, System.Collections.IEqualityComparer)' failed.

Related information

• 9.0.100-preview.7.24407.12

[vzarytovskii]

Duplicate of #17447, likely

[iminashi]

I ran into this when testing if #17447 was fixed in 9.0.100 (it is).

[iminashi]

The example above works in 8.0.400, but fails in 9.0.100.

The example in #17447 fails in 8.0.400, but works in 9.0.100.

[T-Gro]

Still repro's in main -> issue has to be fixed.

[KevinRansom]

@iminashi - Thank you for raising this issue, it forced me to properly think about the codegen that needs to happen for Equality(typed, IComparable) which is wierdly enough different from all of the other Augmented Equals and Compare methods.