Bug 24529 - Compiler issue with 'is' 'as' keywords
Summary: Compiler issue with 'is' 'as' keywords
Status: RESOLVED FEATURE
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: ---
Assignee: Marek Safar
URL:
Depends on:
Blocks:
 
Reported: 2014-11-14 06:55 UTC by Anubhav Ranjan
Modified: 2014-11-14 07:31 UTC (History)
1 user (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Related Links:
Status:
RESOLVED FEATURE

Description Anubhav Ranjan 2014-11-14 06:55:13 UTC
One of our clients have been facing issue with PCL having is as keyword.
The project compiles and runs perfectly on Windows but gives compile time error in XS in Mac.

The error generally states,

The second operand of `is' or `as' operator cannot be static type `System.Nullable'

I have uploaded the sample project at this location
https://db.tt/roGF6UAi


The version information from the client system are as follows:

Microsoft Visual Studio Premium 2013
Version 12.0.30723.00 Update 3
Microsoft .NET Framework
Version 4.5.50938

Installed Version: Premium

LightSwitch for Visual Studio 2013 06191-004-0456024-02610
Microsoft LightSwitch for Visual Studio 2013

Team Explorer for Visual Studio 2013 06191-004-0456024-02610
Microsoft Team Explorer for Visual Studio 2013

Visual Basic 2013 06191-004-0456024-02610
Microsoft Visual Basic 2013

Visual C# 2013 06191-004-0456024-02610
Microsoft Visual C# 2013

Visual C++ 2013 06191-004-0456024-02610
Microsoft Visual C++ 2013

Visual F# 2013 06191-004-0456024-02610
Microsoft Visual F# 2013

Visual Studio 2013 Code Analysis Spell Checker 06191-004-0456024-02610
Microsoft® Visual Studio® 2013 Code Analysis Spell Checker

Portions of International CorrectSpell™ spelling correction system © 1993 by Lernout & Hauspie Speech Products N.V. All rights reserved.

The American Heritage® Dictionary of the English Language, Third Edition Copyright © 1992 Houghton Mifflin Company. Electronic version licensed from Lernout & Hauspie Speech Products N.V. All rights reserved.

Application Insights Tools for Visual Studio Package 1.0
Application Insights Tools for Visual Studio

ASP.NET and Web Tools 12.3.50717.0
Microsoft Web Developer Tools contains the following components:
Support for creating and opening ASP.NET web projects
Browser Link: A communication channel between Visual Studio and browsers
Editor extensions for HTML, CSS, and JavaScript
Page Inspector: Inspection tool for ASP.NET web projects
Scaffolding: A framework for building and running code generators
Server Explorer extensions for Microsoft Azure Websites
Web publishing: Extensions for publishing ASP.NET web projects to hosting providers, on-premises servers, or Microsoft Azure

ASP.NET Web Frameworks and Tools 2012.2 4.1.21001.0
For additional information, visit http://go.microsoft.com/fwlink/?LinkID=309563

ASP.NET Web Frameworks and Tools 2013 5.2.20703.0
For additional information, visit http://www.asp.net/

Common Azure Tools 1.2
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Microsoft Azure Mobile Services Tools 1.2
Microsoft Azure Mobile Services Tools

NuGet Package Manager 2.8.50313.46
NuGet Package Manager in Visual Studio. For more information about NuGet, visit http://docs.nuget.org/.

Office Developer Tools for Visual Studio 2013 ENU 12.0.30626
Microsoft Office Developer Tools for Visual Studio 2013 ENU

PowerShell Tools 1.2
Provides file classification services using PowerShell

PreEmptive Analytics Visualizer 1.2
Microsoft Visual Studio extension to visualize aggregated summaries from the PreEmptive Analytics product.

SQL Server Data Tools 12.0.40706.0
Microsoft SQL Server Data Tools

VisualSVN 4.0.2
Integration with Subversion version control. For more information about VisualSVN, see the VisualSVN website at http://www.visualsvn.com
Copyright © 2005-2013 VisualSVN Ltd. All rights reserved.

Windows Azure Remote Debugging 1.0
Windows Azure Remote Debugging Community Technology Preview

Windows Azure Tools 2.2
Windows Azure Tools for Microsoft Visual Studio 2013 - v2.2.11003.1601

Windows Phone 8.1 SDK Integration 1.0
This package integrates the tools for the Windows Phone 8.1 SDK into the menus and controls of Visual Studio.

Workflow Manager Tools 1.0 1.0
This package contains the necessary Visual Studio integration components for Workflow Manager.

Xamarin 3.7.248.0 (8ca7d11db8a6f874c6cd2de6d9ca0f511867ce91)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin.Android 4.18.1.3 (5474129af31e9d3a86cb7482c7c5c7a30ad315f1)
Visual Studio plugin to enable development for Xamarin.Android.

Xamarin.iOS 8.4.0.0 (209abebbd8f1a292d042420edb45fa5fbd3f017b)
Visual Studio extension to enable development for Xamarin.iOS.


=== Xamarin Studio ===

Version 5.5.3 (build 6)
Installation UUID: 64fde9af-ab01-4479-8d04-301503c2a967
Runtime:
Mono 3.10.0 ((detached/e204655)
GTK+ 2.24.23 (Raleigh theme)

Package version: 310000023

=== Apple Developer Tools ===

Xcode 6.1 (6604)
Build 6A1052d

=== Xamarin.Mac ===

Version:

=== Xamarin.iOS ===

Version: 8.4.0.16 (Business Edition)
Hash: 80e9ff7
Branch:
Build date: 2014-10-22 15:09:12-0400

=== Xamarin.Android ===

Version: 4.18.1 (Business Edition)
Android SDK: /Users/tlorenzen/Library/Developer/Xamarin/android-sdk-mac_x86
Supported Android versions:
2.1 (API level 7)
2.2 (API level 8)
2.3 (API level 10)
3.0 (API level 11)
3.1 (API level 12)
3.2 (API level 13)
4.0 (API level 14)
4.0.3 (API level 15)
4.1 (API level 16)
4.3 (API level 18)
4.4 (API level 19)
Java SDK: /usr
java version "1.8.0_05"
Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

=== Build Information ===

Release ID: 505030006
Git revision: fbe3e9453daf6a3bb9a9709ed22bec35f7c9056b
Build date: 2014-10-23 13:08:38-04
Xamarin addins: e44add2b39de4dd57c0742bb2e620dfad84c64c6

=== Operating System ===

Mac OS X 10.10.0
Darwin Tims-MacBook-Pro.local 14.0.0 Darwin Kernel Version 14.0.0
Fri Sep 19 00:26:44 PDT 2014
root:xnu-2782.1.97~2/RELEASE_X86_64 x86_64
Comment 1 Marek Safar 2014-11-14 07:31:58 UTC
This is a bug in Microsoft C# implementation (fixed in upcoming version). The workaround is very simple as the code can be deleted because will never be true.