ResharperCodeContractNullability (nuget): Reports diagnostics, helping you to annotate your source tree with (Item)NotNull / (Item)CanBeNull attributes. See also: https://www.jetbrains.com/resharper/help/Code_Analysis__Code_Annotations.html  You need Visual Studio 2015/2017/2019 and Resharper v9 or higher to use this analyzer. See package "ResharperCodeContractNullabilityFxCop" if you use Visual Studio 2013 or lower.
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