Bug 33982 - Dynamic object changes behaviour of generic method
Summary: Dynamic object changes behaviour of generic method
Status: RESOLVED FEATURE
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: 4.0.0
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
URL:
Depends on:
Blocks:
 
Reported: 2015-09-15 15:11 UTC by Michael de Lang
Modified: 2015-09-16 04:24 UTC (History)
2 users (show)

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


Attachments
.cs file showcasing the problem (286 bytes, text/x-csharp)
2015-09-15 15:11 UTC, Michael de Lang
Details


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 FEATURE

Description Michael de Lang 2015-09-15 15:11:17 UTC
See attachment.

I expect a compiler error about not being able to implicitly convert an int to a string, but instead, the function returns a dynamic object, which is different from the method specification.
Comment 1 Michael de Lang 2015-09-15 15:11:56 UTC
Created attachment 12901 [details]
.cs file showcasing the problem
Comment 2 Michael de Lang 2015-09-15 15:25:05 UTC
Compile using mcs /target:library BuggyClass.cs
Running is not relevant.
Mono C# compiler version 4.0.4.0
Comment 3 Marek Safar 2015-09-16 04:24:57 UTC
That's feature of dynamic binder. You are passing a dynamic object in which in this case is ExpandoObject but that's not known to compiler and it can be anything therefore this method may not even match. You get correct error during execution when the actual overload resolution happens