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Compiler Error CS0181

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Attribute constructor parameter has type, which is not a valid attribute parameter type

Example

The following sample generates CS0181:

// CS0181.cs (12,6)

using System;
using System.Runtime.InteropServices;
[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
unsafe class Attr : Attribute
{
    public Attr(delegate*<void> d) {}
}
unsafe class C
{
    [UnmanagedCallersOnly]
    [Attr(&M1)]
    static void M1()
    {
    }
}

The CLR currently does not allow generic attribute parameter types, so C# does not allow generic attribute parameter types.