[Mono-bugs] [Bug 623260] New: boxing issue with abstract class from interface

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http://bugzilla.novell.com/show_bug.cgi?id=623260

http://bugzilla.novell.com/show_bug.cgi?id=623260#c0


           Summary: boxing issue with abstract class from interface
    Classification: Mono
           Product: Mono: Runtime
           Version: 2.6.x
          Platform: x86
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: generics
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: koruptid at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Created an attachment (id=376619)
 --> (http://bugzilla.novell.com/attachment.cgi?id=376619)
Example Project

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.6)
Gecko/20100625 Firefox/3.6.6

If a class inherits from an abstract class that is inherited from an interface
the boxing of the base interface is lost when trying to call a generic function
from within the overridden generic function derived from the interface.

Demonstration attached. This code compiles, runs, and gives correct result on
VS 2010.

Reproducible: Always

Actual Results:  
/Main.cs(77,32): Error CS0314: The type 'T' cannot be used as a type parameter
'T' in the generic type or method 'GenericsError.ConcreteTest.Child<T,U>()'.
There is no boxing or type parameter conversion from 'T' to
GenericsError.ITType<U>'

Expected Results:  
Hello World!
Press any key to continue...

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