[Mono-bugs] [Bug 660077] New: CS1640 error that is not present in MS.NET

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Thu Dec 16 22:39:05 EST 2010



           Summary: CS1640 error that is not present in MS.NET
    Classification: Mono
           Product: Mono: Compilers
           Version: 2.8.x
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: msafar at novell.com
        ReportedBy: ircubic at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---

Created an attachment (id=405237)
 --> (http://bugzilla.novell.com/attachment.cgi?id=405237)
Testcase files

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/534.10
(KHTML, like Gecko) Chrome/8.0.552.215 Safari/534.10

As I was trying to compile the codebase of EVEMon
(http://evemon.battleclinic.com/) using MonoDevelop (primarily to figure out if
there was any hope of it compiling on Mono), I ran into what I believe to be a
bug in the C# compiler. I've condensed it into a small test case which I have
attached, and confirmed that the error does not happen on MS.NET (using the
compiler that comes with VS2010).

The error does not happen if the code is compiled as a single exe, or if the
GlobalMonitoredCharacterCollection class definition is moved over to "test.cs"

Reproducible: Always

Steps to Reproduce:
1. Attempt to compile the attached files with the following commandline:
mcs /target:library /out:lib.dll lib.cs
mcs /r:lib.dll test.cs
2. Glare annoyedly at error message
Actual Results:  
test.cs(9,25): error CS1640: foreach statement cannot operate on variables of
type `Testing.Common.GlobalMonitoredCharacterCollection' because it contains
multiple implementation of `System.Collections.Generic.IEnumerable<T>'. Try
casting to a specific implementation
/home/cubic/temp/mono-bug/lib.dll (Location of the symbol related to previous
Compilation failed: 1 error(s), 0 warnings

Expected Results:  
The succesful compilation of the testcase.

I am using Arch Linux.

$ mcs --version
Mono C# compiler version
$ uname -a
Linux fancy 2.6.36-ARCH #1 SMP PREEMPT Wed Nov 24 06:44:11 UTC 2010 i686 AMD
Athlon(tm) 64 X2 Dual Core Processor 4200+ AuthenticAMD GNU/Linux

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