Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
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
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.
The following is legal in the .NET runtime but throws an exception in mono.
I asked on microsoft's feedback if this behavior was acceptable and they actually consider it not a bug. To maintain compatibility Mono should also have this "feature".
public static class Program
private static Func<Int32, Int32, bool> Int32D = (x, y) => (x & y) == y;
private static Func<StringComparison, StringComparison, bool> StringComparisonD =
Delegate.CreateDelegate(typeof (Func<StringComparison, StringComparison, bool>), Int32D.Method) as
Func<StringComparison, StringComparison, bool>;
static void Main()
On the CLR this code executes, in mono it throws an ArgumentException.
FWIW I wouldn't read MS' answer as "not a bug", but rather "not a big deal and fixing would break back-compat". But Mono should probably do the same thing for the sake of compatibility.
Fixed in HEAD/2.10 branch.