Microsoft.CodeAnalysis.CSharp.Binder.GetCandidateExtensionMembersInSingleBinder(Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder<Microsoft.CodeAnalysis.CSharp.Symbol>, System.String, System.String, System.Int32, Microsoft.CodeAnalysis.CSharp.LookupOptions, Microsoft.CodeAnalysis.CSharp.Binder)