Microsoft.CodeAnalysis.AddImport.IRemoteMissingImportDiscoveryService.GetUniqueFixesAsync(Microsoft.CodeAnalysis.Checksum, Microsoft.CodeAnalysis.Remote.RemoteServiceCallbackId, Microsoft.CodeAnalysis.DocumentId, Microsoft.CodeAnalysis.Text.TextSpan, System.Collections.Immutable.ImmutableArray<System.String>, Microsoft.CodeAnalysis.AddImport.AddImportOptions, System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.Packaging.PackageSource>, System.Threading.CancellationToken)