Compiler Error CS1031

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Type expected

A type parameter is expected.

Example

The following sample generates CS1031:

// CS1031.cs
namespace x
{
    public class ii
    {
    }

    public class a
    {
        public static operator +(a aa)   // CS1031
        // try the following line instead
        // public static ii operator +(a aa)
        {
            return new ii();
        }

        public static void Main()
        {
            e = new base;   // CS1031, not a type
            e = new this;   // CS1031, not a type
            e = new ();     // CS1031, not a type
        }
    }
}