Dafny encountered an internal error. Please report it at https://github.com/dafny-lang/dafny/issues.
System.NullReferenceException: Object reference not set to an instance of an object.
at Microsoft.Dafny.CollectionType.<>c.b3_0(Type ta)
at System.Linq.Enumerable.SelectManySingleSelectorIterator2.MoveNext() at System.Linq.Enumerable.ConcatIterator1.MoveNext()
at Microsoft.Dafny.Node.Visit(Func2 beforeChildren, Action1 afterChildren, Action`1 reportError)
at Microsoft.Dafny.ExpandAtAttributes.PreResolve(Program program)
at Microsoft.Dafny.ProgramResolver.Resolve(CancellationToken cancellationToken)
at Microsoft.Dafny.LanguageServer.Language.CachingResolver.<>c__DisplayClass5_0.<b0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.Dafny.PruneIfNotUsedSinceLastPruneCache2.UseAndPrune[T](Func1 use, CancellationToken cancellationToken)
at Microsoft.Dafny.LanguageServer.Language.CacheExtensions.ProfileAndPruneCache[T,TKey,TValue](PruneIfNotUsedSinceLastPruneCache2 cache, Func1 useCache, ILogger logger, TelemetryPublisherBase telemetryPublisher, String programName, String activity, CancellationToken cancellationToken)
at Microsoft.Dafny.LanguageServer.Language.Symbols.DafnyLangSymbolResolver.RunDafnyResolver(Compilation compilation, Program program, CancellationToken cancellationToken)
at Microsoft.Dafny.LanguageServer.Language.Symbols.DafnyLangSymbolResolver.ResolveSymbols(Compilation compilation, Program program, CancellationToken cancellationToken)
at Microsoft.Dafny.TextDocumentLoader.ResolveInternal(Compilation compilation, Program program, CancellationToken cancellationToken)
at Microsoft.Dafny.TextDocumentLoader.ResolveAsync(Compilation compilation, Program program, CancellationToken cancellationToken)
at Microsoft.Dafny.Compilation.ResolveAsync()
at Microsoft.Dafny.Compilation.LogExceptions()
What type of operating system are you experiencing the problem on?
Dafny version
4.9.0
Code to produce this issue
Command to run and resulting output
No response
What happened?
Dafny encountered an internal error. Please report it at https://github.com/dafny-lang/dafny/issues. System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.Dafny.CollectionType.<>c.b3_0(Type ta)
at System.Linq.Enumerable.SelectManySingleSelectorIteratorb 0>d.MoveNext()
--- End of stack trace from previous location ---
at Microsoft.Dafny.PruneIfNotUsedSinceLastPruneCache
2.MoveNext() at System.Linq.Enumerable.ConcatIterator1.MoveNext() at Microsoft.Dafny.Node.Visit(Func2 beforeChildren, Action1 afterChildren, Action`1 reportError) at Microsoft.Dafny.ExpandAtAttributes.PreResolve(Program program) at Microsoft.Dafny.ProgramResolver.Resolve(CancellationToken cancellationToken) at Microsoft.Dafny.LanguageServer.Language.CachingResolver.<>c__DisplayClass5_0.<2.UseAndPrune[T](Func1 use, CancellationToken cancellationToken) at Microsoft.Dafny.LanguageServer.Language.CacheExtensions.ProfileAndPruneCache[T,TKey,TValue](PruneIfNotUsedSinceLastPruneCache2 cache, Func1 useCache, ILogger logger, TelemetryPublisherBase telemetryPublisher, String programName, String activity, CancellationToken cancellationToken) at Microsoft.Dafny.LanguageServer.Language.Symbols.DafnyLangSymbolResolver.RunDafnyResolver(Compilation compilation, Program program, CancellationToken cancellationToken) at Microsoft.Dafny.LanguageServer.Language.Symbols.DafnyLangSymbolResolver.ResolveSymbols(Compilation compilation, Program program, CancellationToken cancellationToken) at Microsoft.Dafny.TextDocumentLoader.ResolveInternal(Compilation compilation, Program program, CancellationToken cancellationToken) at Microsoft.Dafny.TextDocumentLoader.ResolveAsync(Compilation compilation, Program program, CancellationToken cancellationToken) at Microsoft.Dafny.Compilation.ResolveAsync() at Microsoft.Dafny.Compilation.LogExceptions()What type of operating system are you experiencing the problem on?
Mac