Base:
method
AppendDiagnosticsAsync
Microsoft.CodeAnalysis.Diagnostics.EngineV2.DiagnosticIncrementalAnalyzer.DiagnosticGetter.AppendDiagnosticsAsync(Microsoft.CodeAnalysis.Project, System.Collections.Generic.IEnumerable<Microsoft.CodeAnalysis.DocumentId>, System.Boolean, System.Threading.CancellationToken)