[IronPython] Possible regression in IronPython pre b5 to do with delegates

[Dan Eloff]

It does seem like a bug. I found a way around it, and also confirmed
that it still exists in the latest sources (Friday's)

I went ahead and opened a ticket:
http://www.codeplex.com/IronPython/WorkItem/View.aspx?WorkItemId=18345

-Dan

On Fri, Sep 5, 2008 at 7:44 PM, Dino Viehland <dinov at microsoft.com> wrote:
> I'm pretty sure this is a bug... Tomas stumbled across something like this recently too.
>
> -----Original Message-----
> From: users-bounces at lists.ironpython.com [mailto:users-bounces at lists.ironpython.com] On Behalf Of Dan Eloff
> Sent: Friday, September 05, 2008 4:59 PM
> To: Discussion of IronPython
> Subject: [IronPython] Possible regression in IronPython pre b5 to do with delegates
>
> Could someone please check if this is indeed a regression in the
> current IronPython sources? I'm using the sdlsdk version.
>
> TypeError: Value cannot be null.
> Parameter name: context
>
> Caused by:
>
> req.BeginGetResponse(self.handle_response, (req, success, failure))
>
> Simply changing this to: "lambda r: self.handle_response" is enough to
> get past it (no idea yet it it runs fine, but it should.)
>
> Full traceback follows:
>
> at Microsoft.Scripting.Utils.ContractUtils.RequiresNotNull(Object
> value, String paramName)
>   at Microsoft.Scripting.Runtime.BinderOps.GetDelegate(CodeContext
> context, Object callableObject, Type delegateType)
>   at _stub_$921##366(Closure , CallSite , Method )
>   at System.Scripting.Actions.MatchCaller.Call1[T0,TRet](Func`3
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update1[T,T0,TRet](CallSite
> site, T0 arg0)
>   at _stub_$920##365(Closure , CallSite , CodeContext , Object ,
> Object , PythonTuple )
>   at System.Scripting.Actions.MatchCaller.Call4[T0,T1,T2,T3,TRet](Func`6
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update4[T,T0,T1,T2,T3,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>   at S$13.Request$377(Closure , Object self, Object uri, Object
> success, Object failure, Object data)
>   at _stub_$866##311(Closure , CallSite , CodeContext , Object ,
> Object , String , Object )
>   at System.Scripting.Actions.MatchCaller.Call5[T0,T1,T2,T3,T4,TRet](Func`7
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update5[T,T0,T1,T2,T3,T4,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4)
>   at _stub_$865##310(Closure , CallSite , CodeContext , Object ,
> String , Object )
>   at System.Scripting.Actions.MatchCaller.Call4[T0,T1,T2,T3,TRet](Func`6
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update4[T,T0,T1,T2,T3,TRet](CallSite
> site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
>   at S$36.Load$848(Closure , Object self)
>   at _stub_$174##43(Closure , CallSite , CodeContext , Object , Object )
>   at _stub_$173##42(Closure , CallSite , CodeContext , Object )
>   at System.Scripting.Actions.MatchCaller.Call2[T0,T1,TRet](Func`4
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update2[T,T0,T1,TRet](CallSite
> site, T0 arg0, T1 arg1)
>   at S$9.Initialize(Scope $scope, LanguageContext $language)
>   at Microsoft.Scripting.Runtime.OptimizedScriptCode.InvokeTarget(LambdaExpression
> code, Scope scope)
>   at Microsoft.Scripting.ScriptCode.Run(Scope scope)
>   at IronPython.Runtime.PythonContext.CreateModule(String fileName,
> Scope scope, ScriptCode scriptCode, ModuleOptions options)
>   at IronPython.Runtime.PythonContext.CompileModule(String fileName,
> String moduleName, SourceUnit sourceCode, ModuleOptions options,
> ScriptCode& scriptCode)
>   at IronPython.Runtime.PythonContext.CompileModule(String fileName,
> String moduleName, SourceUnit sourceCode, ModuleOptions options)
>   at IronPython.Runtime.Importer.LoadFromSourceUnit(CodeContext
> context, SourceUnit sourceCode, String name, String path)
>   at IronPython.Runtime.Importer.LoadModuleFromSource(CodeContext
> context, String name, String path)
>   at IronPython.Runtime.Importer.LoadPackageFromSource(CodeContext
> context, String name, String path)
>   at IronPython.Runtime.Importer.ImportFromPath(CodeContext context,
> String name, String fullName, List path)
>   at IronPython.Runtime.Importer.ImportTopAbsolute(CodeContext
> context, String name)
>   at IronPython.Runtime.Importer.ImportModule(CodeContext context,
> Object globals, String modName, Boolean bottom, Int32 level)
>   at IronPython.Runtime.Builtin.__import__(CodeContext context,
> String name, Object globals, Object locals, Object fromlist, Int32
> level)
>   at IronPython.Runtime.Builtin.__import__(CodeContext context,
> String name, Object globals, Object locals, Object fromlist)
>   at _stub_$12##2(Closure , CallSite , CodeContext , Object , String
> , IAttributesCollection , IAttributesCollection , PythonTuple )
>   at IronPython.Runtime.Importer.Import(CodeContext context, String
> fullName, PythonTuple from, Int32 level)
>   at IronPython.Runtime.Operations.PythonOps.ImportTop(CodeContext
> context, String fullName, Int32 level)
>   at S$1.startup$10()
>   at _stub_$297##139(Closure , CallSite , CodeContext , Object )
>   at System.Scripting.Actions.MatchCaller.Call2[T0,T1,TRet](Func`4
> target, CallSite site, Object[] args)
>   at System.Scripting.Actions.CallSite`1.UpdateAndExecute(Object[] args)
>   at System.Scripting.Actions.UpdateDelegates.Update2[T,T0,T1,TRet](CallSite
> site, T0 arg0, T1 arg1)
>   at S$1.Initialize(Scope $scope, LanguageContext $language)
>   at Microsoft.Scripting.Runtime.OptimizedScriptCode.InvokeTarget(LambdaExpression
> code, Scope scope)
>   at Microsoft.Scripting.ScriptCode.Run(Scope scope)
>   at Microsoft.Scripting.Hosting.CompiledCode.Execute()
>   at Microsoft.Scripting.Silverlight.DynamicApplication.StartMainProgram()
>   at Microsoft.Scripting.Silverlight.DynamicApplication.DynamicApplication_Startup(Object
> sender, StartupEventArgs e)
>   at System.Windows.CoreInvokeHandler.InvokeEventHandler(Int32
> typeIndex, Delegate handlerDelegate, Object sender, Object args)
>   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr
> unmanagedObjArgs, Int32 argsTypeIndex, String eventName)
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