Enum.GetValues fails with attempt to call a nil value (method 'getIsEnum')

[joelverhagen]

Repro

namespace Knapcode
{
    public static class ClassA
    {
        public static void MyMethod()
        {
            Console.WriteLine(string.Join(", ", Enum.GetValues<MyEnum>()));
        }
    }

    public enum MyEnum
    {
        Foo,
        Bar,
    }
}

Generated Lua:

-- Generated by CSharp.lua Compiler
do
local System = System
System.namespace("Knapcode", function (namespace)
  namespace.class("ClassA", function (namespace)
    local MyMethod
    MyMethod = function ()
      System.Console.WriteLine(System.String.JoinEnumerable(", ", System.Enum.GetValues(System.Int32)))
    end
    return {
      MyMethod = MyMethod
    }
  end)

end)

end
System.init({
  types = {
    "Knapcode.ClassA"
  }
})

If you call MyMethod you get this error:

C:\Users\joelv\Downloads\lua-5.3.6_Win64_bin\lua53.exe: .\out.lua:4274: attempt to call a nil value (method 'getIsEnum')
stack traceback:
        .\out.lua:4274: in field 'GetValues'
        .\out.lua:19537: in field 'MyMethod'
        .\main.lua:3: in main chunk
        [C]: in ?

This can be worked around with a source generator for all values or manually listing all values in source.