---- Reported by atsushi@ximian.com 2007-07-11 06:59:55 MST ----

The example below says that T of Nullable<T> has no constraint, while it is
constrained to struct. (where T : struct, new())

--------
using System;
using System.Reflection;

public class Test
{
        public static void Main ()
        {
                Type t = typeof (int?).GetGenericTypeDefinition ();
                Type n = t.GetGenericArguments () [0];
                Console.WriteLine (n.GetGenericParameterConstraints ().Length);
        }
}
--------

According to .NET ildasm, T in our mscorlib Nullable<T> is constrained, so
it's just that Type.GetGenericParameterConstraints() returns nothing.

I believe it used to work fine before (around a year ago). And IIRC this
issue existed before IMT (r81715). (Just dug into this issue today.)

It is also shown as corcompare difference in mscorlib page.



---- Additional Comments From vargaz@gmail.com 2007-07-31 10:30:58 MST ----

This is a gmcs bug. In the following test case:
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
using System;
using System.Reflection;

public class Nullable2<T> where T : struct {
}

public class Test
{
        public static void Main ()
        {
                Type t = typeof
(Nullable2<int>).GetGenericTypeDefinition ();
                Type n = t.GetGenericArguments () [0];
                Console.WriteLine (n.GetGenericParameterConstraints
().Length);
                Console.WriteLine (n.GetGenericParameterConstraints
()[0]);
        }
}
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

gmcs encodes the constraints as:
<valuetype T>
while csc encodes it as:
<valuetype .ctor ([mscorlib]System.ValueType) T>



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