Microsoft.CodeAnalysis.CSharp.Completion.Providers.DeclarationName.IDeclarationNameRecommender.ProvideRecommendedNamesAsync(Microsoft.CodeAnalysis.Completion.CompletionContext, Microsoft.CodeAnalysis.Document, Microsoft.CodeAnalysis.CSharp.Extensions.ContextQuery.CSharpSyntaxContext, Microsoft.CodeAnalysis.CSharp.Completion.Providers.DeclarationName.NameDeclarationInfo, System.Threading.CancellationToken)