I've just installed the .NET 4.5 reference source from Microsoft as I'm trying to debug an issue I'm seeing and I stumbled across the following in HttpApplication.cs.

// execution step -- call asynchronous event
internal class AsyncEventExecutionStep : IExecutionStep { 
    private HttpApplication     _application;
    private BeginEventHandler   _beginHandler;
    private EndEventHandler     _endHandler;
    private Object              _state; 
    private AsyncCallback       _completionCallback;
    private AsyncStepCompletionInfo _asyncStepCompletionInfo; // per call 
    private bool                _[....];          // per call 
    private string              _targetTypeStr;

Notice the next-to-last line private bool _[....]; // per call.

Is _[....] a valid identifier (at any level of compilation, including IL) or has the source been changed since compilation?

c# asp.net .net-4.5 httpapplication
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