Bug 36425 - Erroneous CS0266 error
Summary: Erroneous CS0266 error
Status: RESOLVED FIXED
Alias: None
Product: Compilers
Classification: Mono
Component: C# (show other bugs)
Version: 4.0.0
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: Marek Safar
URL:
Depends on:
Blocks:
 
Reported: 2015-12-01 14:53 UTC by Brian
Modified: 2015-12-01 21:56 UTC (History)
1 user (show)

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

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.


Please create a new report on GitHub or Developer Community with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:
Status:
RESOLVED FIXED

Description Brian 2015-12-01 14:53:04 UTC
Hi,

If I try to compile the below statement under Mono 4.2.1: 

var x = (myObject?.MyChildObject is ISomeInterface) ? 1 : 0;


I get the following error:

error CS0266: Cannot implicitly convert type `bool?' to `bool'. An explicit conversion exists (are you missing a cast?)

On MS .NET this compiles fine
Comment 1 Marek Safar 2015-12-01 21:53:40 UTC
Fixed in master
Comment 2 Brian 2015-12-01 21:56:19 UTC
Awesome, thanks for the quick response!