net481 
namespace 
{
    public static class AsyncCompatLibExtensions
    {
        public static Task<Stream> GetRequestStreamAsync(this WebRequest source);
    }
}
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.NET Framework
4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.CompilerServices.AsyncTargetingPack.Net4 , Version=1.0.0.0, PublicKeyToken=31bf3856ad364e35

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Your project needs a package reference to Microsoft.CompilerServices.AsyncTargetingPack.

Package Microsoft.CompilerServices.AsyncTargetingPack (1.0.1) net40
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