Bug 18324 - [Compiler][Already fixed in Mono 3.2.7] Invalid IL code when calling method from within async delegate without await
Summary: [Compiler][Already fixed in Mono 3.2.7] Invalid IL code when calling method ...
Alias: None
Product: Android
Classification: Xamarin
Component: General (show other bugs)
Version: 4.12.0
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Jonathan Pryor
Depends on:
Reported: 2014-03-12 14:15 UTC by Brendan Zagaeski (Xamarin Team, assistant)
Modified: 2014-03-13 04:12 UTC (History)
2 users (show)

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

Test case (11.29 KB, application/zip)
2014-03-12 14:15 UTC, Brendan Zagaeski (Xamarin Team, assistant)

Description Brendan Zagaeski (Xamarin Team, assistant) 2014-03-12 14:15:57 UTC
Created attachment 6294 [details]
Test case

Possible duplicates:
Bug #15527
Bug #13356

For this particular test case, the problem appears to be fixed on Mono 3.2.7 (currently on the Alpha channel).

## Steps to reproduce

1. Build and run the attached project using the Debug configuration in Xamarin Studio on Mac.

2. Click the "Hello World, Click Me!" button.

## Result.

> UNHANDLED EXCEPTION: System.InvalidProgramException: Invalid IL code in TestApp.MainActivity/<OnCreate>c__async0:MoveNext (): IL_0013: ldloc.1   
> at System.Runtime.CompilerServices.AsyncVoidMethodBuilder.Start<TestApp.MainActivity/<OnCreate>c__async0> (TestApp.MainActivity/<OnCreate>c__async0&) <IL 0x00022, 0x000bb>
> at TestApp.MainActivity.<OnCreate>m__0 (object,System.EventArgs) [0x00000] in /Volumes/ramdisk/TestApp/TestApp/MainActivity.cs:29
> at Android.Views.View/IOnClickListenerImplementor.OnClick (Android.Views.View) [0x0000d] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.12-series/0deb0164/source/monodroid/src/Mono.Android/platforms/android-10/src/generated/Android.Views.View.cs:900
> at Android.Views.View/IOnClickListenerInvoker.n_OnClick_Landroid_view_View_ (intptr,intptr,intptr) [0x00011] in /Users/builder/data/lanes/monodroid-mlion-monodroid-4.12-series/0deb0164/source/monodroid/src/Mono.Android/platforms/android-10/src/generated/Android.Views.View.cs:867
> at (wrapper dynamic-method) object.6e58b830-e440-4754-a730-4092cfad80d6 (intptr,intptr,intptr) <IL 0x00017, 0x00043>

## Workarounds

A. Remove the `async` keyword from the button.Click delegate.


B. Change `Class1.DoSomeWork()` to an `async Task` method, and add `await` on the call to `class1.DoSomeWork()`


C. Upgrade to Mono 3.2.7, then clean, and rebuild the solution.

## Version information

Tested on:
- Xamarin.Android 4.12.1
- Xamarin Studio 4.2.3 build 60
- Mono 3.2.6
- OS X 10.8.5

The problem does not happen when the project is built and run from Windows.
Comment 1 Sadik Ali 2014-03-13 03:42:23 UTC
I have checked this issue on below environments:

All MAC, Windows
XS 4.2.3 (Build 60)
XA: 4.12.1
Mono Mac 3.2.6

I followed steps mentioned  as in bug description and noticed that same exception is generated when click on Hello World, Click Me!" button.

Screen cast: http://screencast.com/t/aaZEQIR6
Exception log: https://gist.github.com/Sadik1/9523454
I check this on Window machine and not getting any exception. 

Also I check with Workarounds as mentioned in bug description and noticed that it is working

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