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After upgrading to Xamarin iOS 6.4.4, the Async/await code throws an ExecutionEngineException exception. However it seems to work on X.iOS 6.4.3
"ExecutionEngineException: Attempting to JIT compile method 'ourapp.TouchTaskFactory:StartNew (System.Func`1)' while running with --aot-only. See http://docs.xamarin.com/ios/about/limitations for more information."
More details on the forum post here: http://forums.xamarin.com/discussion/7692/fatal-runtime-generics-issue-after-update-to-xamarin-ios-6-4
Please provide a slef-contained test case. A link to partial code is not enough to duplicate the issue.
note: the last part of the discussion thread is a bug alreaday fixed in 6.4.5 (but unrelated to a ExecutionEngineException).
Closing, no test case was provided and this area has seen many huge changes since XI 6.4.