Microsoft.CodeAnalysis.SolutionExplorer.AbstractSolutionExplorerSymbolTreeItemProvider<TCompilationUnitSyntax, TMemberDeclarationSyntax, TNamespaceDeclarationSyntax, TEnumDeclarationSyntax, TTypeDeclarationSyntax>.AddEnumDeclarationMembers(Microsoft.CodeAnalysis.DocumentId, TEnumDeclarationSyntax, Microsoft.CodeAnalysis.PooledObjects.ArrayBuilder<Microsoft.CodeAnalysis.SolutionExplorer.SymbolTreeItemData>, System.Threading.CancellationToken)