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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"NullReferenceException in AstTypeAnnotationConverter.MakeGenericClassType","articleBody":"Got this while looking into #391 some more.\r\n\r\n```\r\n[Error - 10:58:54 AM] System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.) ---\u003e System.NullReferenceException: Object reference not set to an instance of an object.\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstTypeAnnotationConverter.MakeGenericClassType(IPythonType typeArg) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstTypeAnnotationConverter.cs:line 201\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstTypeAnnotationConverter.MakeGeneric(IPythonType baseType, IReadOnlyList`1 args) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstTypeAnnotationConverter.cs:line 135\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.Walker.MakeGenericOp.Apply[T](TypeAnnotationConverter`1 converter, Stack`1 stack) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 266\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.Walker.GetResult[T](TypeAnnotationConverter`1 converter) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 71\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.GetValue[T](TypeAnnotationConverter`1 converter) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 49\r\n   at Microsoft.PythonTools.Interpreter.Ast.NameLookupContext.GetTypesFromAnnotation(Expression expr) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\NameLookupContext.cs:line 158\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalker.Walk() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalker.cs:line 68\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalkerSet.ProcessWalker(AstAnalysisFunctionWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalkerSet.cs:line 64\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalkerSet.ProcessSet() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalkerSet.cs:line 51\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisWalker.Complete() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisWalker.cs:line 90\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstScrapedPythonModule.PostWalk(PythonWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstScrapedPythonModule.cs:line 139\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstScrapedPythonModule.Imported(IModuleContext context) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstScrapedPythonModule.cs:line 251\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstPythonMultipleMembers.MultipleModuleMembers.Imported(IModuleContext context) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstPythonMultipleMembers.cs:line 199\r\n   --- End of inner exception stack trace ---\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstPythonInterpreter.ImportModule(String name) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstPythonInterpreter.cs:line 263\r\n   at Microsoft.PythonTools.Analysis.ModuleTable.TryImport(String name, ModuleReference\u0026 moduleReference) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\ModuleTable.cs:line 128\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.TryImportModule(String modName, Boolean forceAbsolute, ModuleReference\u0026 moduleRef, IReadOnlyList`1\u0026 remainingParts) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Analyzer\\DDG.cs:line 440\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Walk(FromImportStatement node) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Analyzer\\DDG.cs:line 365\r\n   at Microsoft.PythonTools.Parsing.Ast.FromImportStatement.Walk(PythonWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\FromImportStatement.cs:line 61\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Walk(SuiteStatement node) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Analyzer\\DDG.cs:line 665\r\n   at Microsoft.PythonTools.Parsing.Ast.SuiteStatement.Walk(PythonWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\SuiteStatement.cs:line 34\r\n   at Microsoft.PythonTools.Parsing.Ast.PythonAst.Walk(PythonWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\PythonAst.cs:line 92\r\n   at Microsoft.PythonTools.Analysis.AnalysisUnit.AnalyzeWorker(DDG ddg, CancellationToken cancel) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\AnalysisUnit.cs:line 154\r\n   at Microsoft.PythonTools.Analysis.AnalysisUnit.Analyze(DDG ddg, CancellationToken cancel) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\AnalysisUnit.cs:line 139\r\n   at Microsoft.PythonTools.Analysis.Analyzer.DDG.Analyze(Deque`1 queue, CancellationToken cancel, Action`1 reportQueueSize, Int32 reportQueueInterval) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Analyzer\\DDG.cs:line 75\r\n   at Microsoft.PythonTools.Analysis.PythonAnalyzer.AnalyzeQueuedEntries(CancellationToken cancel) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\PythonAnalyzer.cs:line 908\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.GroupAnalysis.Analyze(CancellationToken cancel) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Intellisense\\AnalysisQueue.cs:line 229\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.HandleAnalyzable(IAnalyzable item, AnalysisPriority priority, CancellationToken cancellationToken) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Intellisense\\AnalysisQueue.cs:line 152\r\n   at Microsoft.PythonTools.Intellisense.AnalysisQueue.ConsumerLoop() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Intellisense\\AnalysisQueue.cs:line 64\r\n---\u003e (Inner Exception #0) System.NullReferenceException: Object reference not set to an instance of an object.\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstTypeAnnotationConverter.MakeGenericClassType(IPythonType typeArg) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstTypeAnnotationConverter.cs:line 201\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstTypeAnnotationConverter.MakeGeneric(IPythonType baseType, IReadOnlyList`1 args) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstTypeAnnotationConverter.cs:line 135\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.Walker.MakeGenericOp.Apply[T](TypeAnnotationConverter`1 converter, Stack`1 stack) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 266\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.Walker.GetResult[T](TypeAnnotationConverter`1 converter) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 71\r\n   at Microsoft.PythonTools.Parsing.Ast.TypeAnnotation.GetValue[T](TypeAnnotationConverter`1 converter) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Parsing\\Ast\\TypeAnnotation.cs:line 49\r\n   at Microsoft.PythonTools.Interpreter.Ast.NameLookupContext.GetTypesFromAnnotation(Expression expr) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\NameLookupContext.cs:line 158\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalker.Walk() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalker.cs:line 68\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalkerSet.ProcessWalker(AstAnalysisFunctionWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalkerSet.cs:line 64\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisFunctionWalkerSet.ProcessSet() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisFunctionWalkerSet.cs:line 51\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstAnalysisWalker.Complete() in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstAnalysisWalker.cs:line 90\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstScrapedPythonModule.PostWalk(PythonWalker walker) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstScrapedPythonModule.cs:line 139\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstScrapedPythonModule.Imported(IModuleContext context) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstScrapedPythonModule.cs:line 251\r\n   at Microsoft.PythonTools.Interpreter.Ast.AstPythonMultipleMembers.MultipleModuleMembers.Imported(IModuleContext context) in C:\\Users\\jabaile\\python-language-server\\src\\Analysis\\Engine\\Impl\\Interpreter\\Ast\\AstPythonMultipleMembers.cs:line 199\u003c---\r\n```\r\n\r\nThis causes a Debug.Fail in Analysis_UnhandledException.","author":{"url":"https://github.com/jakebailey","@type":"Person","name":"jakebailey"},"datePublished":"2018-12-03T19:05:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/446/python-language-server/issues/446"}