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In this scenario MonoDevelop marks 'ToArray' in red, implying the method does not exist, because it does not take covariance into account. The 'ToArray' extension method's signature is:
T ToArray (IEnumerable<T>)
In this example IEnumerable<B> is covariant towards IEnumerable<A>, so it compiles and executes with no error even though we are passing an IEnumerable<B> to a method expecting IEnumerable<A>.
public class A
public class B : A
static void Main(string args)
var list = new List<B>().ToArray<A>();
fixed that one.
This is not fixed in MD master. Are you sure you committed the change?