Remove Assert in Method.MakeGeneric on Invalid Arg #116788

scott-ferguson-unity · 2025-06-18T14:31:29Z

The call to mono_class_inflate_generic_method_checked will set error when there are invalid types (e.g. typeof(void)/typeof(int*)) passed in. This should not be an assert, we should fall to the "Invalid generic arguments" message below. This does loose the error returned by mono_class_inflate_generic_method_checked but that error isn't user
friendly. It would report be something like:

"MVAR 1 cannot be expanded with type 0x1"

Instead report the more general/readable error to the user.

Fix: #71339.

Repro:

    internal class Program
    {
        static void Main(string[] args)
        {
            try
            {
                typeof(Program)!.GetMethod(nameof(Get))!.MakeGenericMethod(typeof(void));
            }
            catch ( Exception ex)
            {
                Console.WriteLine(ex);
            }
        }

        public T Get<T>() => default;
    }

Result Before:

* Assertion at \src\mono\mono\metadata\reflection.c:2731, condition `is_ok (error)' not met, function:reflection_bind_generic_method_parameters, MVAR 0 cannot be expanded with type 0x1
CRASH!

Result After:

System.ArgumentException: Invalid generic arguments

The call to mono_class_inflate_generic_method_checked will set error when there are invalid types (e.g. typeof(void)/typeof(int*)) passed in. This should not be an assert, it should fall to the "Invalid generic arguments" message below. This does lose the error returned by mono_class_inflate_generic_method_checked but that error isn't user friendly. It would report be something like: "MVAR 1 cannot be expanded with type 0x1" Instead report the more readable error to the user. Fix: 71339

dotnet-policy-service · 2025-06-28T14:20:27Z

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dotnet-policy-service · 2025-06-28T14:20:27Z

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