[Mono-bugs] [Bug 475823] New: ExpressionType.NodeType yield different results when compiled on gmcs vc csc

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Fri Feb 13 14:32:20 EST 2009


           Summary: ExpressionType.NodeType yield different results when
                    compiled on gmcs vc csc
    Classification: Mono
           Product: Mono: Compilers
           Version: SVN
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: basjsmit at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:
Gecko/2009011913 Firefox/3.0.6

Isolated another Moq related gmcs bug. When executed, on either mono or .net,
the code below yields different results when compiled on csc or gmcs.

using System;
using System.Linq.Expressions;

public class Program
    static void Main()
        Expression<Action<IHelper>> e = (helper => helper.DoIt(null));

        var mce = e.Body as MethodCallExpression;
        var et = mce.Arguments[0].NodeType;
        if (et == ExpressionType.Convert)
            Console.WriteLine("Hi from gmcs");
            Console.WriteLine("Hi from csc");

public class Foo { }

public interface IHelper
    void DoIt(Foo foo); // Changing Foo to object hides the bug

Reproducible: Always

Steps to Reproduce:
1.Compile with gmcs and csc
2.Compare results by running both executables

Actual Results:  
Different code paths are followed

Expected Results:  
Same code paths are followed

Compiled with mcs Revision: 126638 on ubuntu, error occurs when run on mono
trunk r126638 or on .net

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