[Mono-bugs] [Bug 480734] New: NullReferenceException when cloning method with [return: MarshalAs(...)] attribute

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https://bugzilla.novell.com/show_bug.cgi?id=480734


           Summary: NullReferenceException when cloning method with
                    [return: MarshalAs(...)] attribute
    Classification: Mono
           Product: Mono: Class Libraries
           Version: unspecified
          Platform: x86-64
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Cecil
        AssignedTo: jbevain at novell.com
        ReportedBy: stapostol at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=276189)
 --> (https://bugzilla.novell.com/attachment.cgi?id=276189)
Test case

Description of Problem: Calling MethodDefinition.Clone() on the following
method results in a NullReferenceException.

[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
public static extern bool SetWindowPos(IntPtr handle, IntPtr insertAfter, int
x, int y, int cx, int cy, int flags);

Removing the "[return: MarshalAs(UnmanagedType.Bool)]" line removes the
exception.

I have attached a small, self-contained test case.

Steps to reproduce the problem:
1. Compile the attached test case against Mono.Cecil 0.6 and run it.


Actual Results:
System.Boolean
Test.Test::SetWindowPos(System.IntPtr,System.IntPtr,System.Int32,System.Int32,System.Int32,System.Int32,System.Int32)
System.NullReferenceException: Object reference not set to an instance of an
object.
   at Mono.Cecil.MethodReturnType.set_MarshalSpec(MarshalSpec value)
   at Mono.Cecil.MethodDefinition.Clone(MethodDefinition meth, ImportContext
context)
   at Mono.Cecil.MethodDefinition.Clone()
   at Test.Test.Main(String[] args) in
[...]\Projects\Tests\CecilMarshalAsBugProgram.cs:line 23

Expected Results:
System.Boolean
Test.Test::SetWindowPos(System.IntPtr,System.IntPtr,System.Int32,System.Int32,System.Int32,System.Int32,System.Int32)
System.Void Test.Test::Main(System.String[])

How often does this happen? 
Always.

Additional Information:
The actual exception happens in MethodReturnType.cs:103 of Mono.Cecil.

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