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Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?

...enough, we could solve this problem by making List contravariant in A, but then the return type List[A] would be invalid as the cons function expects its return type to be covariant. Our only two options here are to a) make A invariant, losing the nice, intuitive sub-typing properties of covariance...
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Autocomplete applying value not label to textbox

... Not the answer you're looking for? Browse other questions tagged jquery asp.net-mvc jquery-ui autocomplete jquery-ui-autocomplete or ask your own question.
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Remove/Add Line Breaks after Specific String using Sublime Text

...d ctrl + d to select the next iteration of the selection. Perhaps the same functionality exists on MAC with Command + d ? You may have to press it numerous times to go through the whole file – shanehoban Apr 30 '15 at 14:51 ...
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What is the purpose of the Visual Studio Hosting Process?

... CLR, it can be "hosted". Examples of custom CLR hosts are SQL Server and ASP.NET. Hosting allows one to configure the CLR before it gets started. One primary use of this is configuring the primary AppDomain and setting up custom security policies. Which is exactly what the hosting process is do...
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jquery $(window).height() is returning the document height

... In my case, I had a Response.Write in my code behind on an ASP site which was outputting a 1 before any HTML. So my doc type was right, but wasn't the first thing on the page, technically. – James Mar 6 '14 at 13:27 ...
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How does Python 2 compare string and int? Why do lists compare as greater than numbers, and tuples g

... Fun fact : complex(1,0) > 'abc' is False but complex(1,0) > complex(0,0) raises a TypeError – Eric Duminil Jan 22 '17 at 18:48 ...
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Why should I not include cpp files and instead use a header?

... test this. And if you find out that you meant to do a x = y - 1 instead, then again, two million lines of compile are waiting for you. That's many hours of time wasted that could be better spent doing anything else. "But I hate being unproductive! If only there was some way to compile distinct ...
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Templated check for the existence of a class member function?

...ember using std::string(T::*)() const as the member function pointer type then!). share | improve this answer | follow | ...
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xUnit : Assert two List are equal?

... Recently, I was using xUnit 2.4.0 and Moq 4.10.1 packages in my asp.net core 2.2 app. In my case I managed to get it work with two steps process: Defining an implementation of IEqualityComparer<T> Pass the comparer instance as a third parameter into Assert.True method: Assert.True...
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What is the best regular expression to check if a string is a valid URL?

...hesis in them: e.g. msdn.microsoft.com/en-us/library/ms563775(v=office.14).aspx – RobH Jul 10 '13 at 9:28 4 ...