csc.exe exited with code -2146232797 when using primary constructor with event in interface

[ds1709]

Version Used:
VS 17.9.2

Steps to Reproduce:
Just define next types:

    public sealed class Foo(DbConnection connection) : IFoo
    {
        public event EventHandler Bar
        {
            add => connection.Disposed += value;
            remove => connection.Disposed -= value;
        }
    }

    public interface IFoo
    {
        event EventHandler Bar;
    }

The key point is:

• use primary constructor;
• class must implement interface;
• interface must contain event;
• event must be implemented via primary constructor parameter.

[svick]

When I put this code into SharpLab, I get the following exception:

System.AggregateException: One or more errors occurred. (Object reference not set to an instance of an object.)
 ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol.get_ParameterCount()
   at Microsoft.CodeAnalysis.CSharp.InMethodBinder.LookupSymbolsInSingleBinder(LookupResult result, String name, Int32 arity, ConsList`1 basesBeingResolved, LookupOptions options, Binder originalBinder, Boolean diagnose, CompoundUseSiteInfo`1& useSiteInfo)
   at Microsoft.CodeAnalysis.CSharp.Binder.LookupSymbolsInternal(LookupResult result, String name, Int32 arity, ConsList`1 basesBeingResolved, LookupOptions options, Boolean diagnose, CompoundUseSiteInfo`1& useSiteInfo)
   at Microsoft.CodeAnalysis.CSharp.Binder.IdentifierUsedAsValueFinder.CheckIdentifiersInNode(CSharpSyntaxNode node, Binder binder)
   at Microsoft.CodeAnalysis.CSharp.Binder.CapturedParametersFinder.<GetCapturedParameters>g__checkParameterReferencesInMethodBody|4_2(CSharpSyntaxNode syntaxNode, Binder bodyBinder, <>c__DisplayClass4_0&)
   at Microsoft.CodeAnalysis.CSharp.Binder.CapturedParametersFinder.GetCapturedParameters(SynthesizedPrimaryConstructor primaryConstructor)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SynthesizedPrimaryConstructor.GetBackingFields()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.AddSynthesizedTypeMembersIfNecessary(MembersAndInitializersBuilder builder, DeclaredMembersAndInitializers declaredMembersAndInitializers, BindingDiagnosticBag diagnostics)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.BuildMembersAndInitializers(BindingDiagnosticBag diagnostics)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.GetMembersByNameSlow()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.GetMembersByName()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.GetMembersUnordered()
   at Microsoft.CodeAnalysis.CSharp.Symbols.TypeSymbol.MakeExplicitInterfaceImplementationMap()
   at Microsoft.CodeAnalysis.CSharp.Symbols.TypeSymbol.GetExplicitImplementationForInterfaceMember(Symbol interfaceMember)
   at Microsoft.CodeAnalysis.CSharp.Symbols.TypeSymbol.ComputeImplementationForInterfaceMember(Symbol interfaceMember, TypeSymbol implementingType, BindingDiagnosticBag diagnostics, Boolean ignoreImplementationInInterfaces, Boolean& implementationInInterfacesMightChangeResult)
   at Microsoft.CodeAnalysis.CSharp.Symbols.TypeSymbol.FindImplementationForInterfaceMemberInNonInterfaceWithDiagnostics(Symbol interfaceMember, Boolean ignoreImplementationInInterfacesIfResultIsNotReady)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceEventSymbol.ComputeIsWindowsRuntimeEvent()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceEventAccessorSymbol.MethodChecks(BindingDiagnosticBag diagnostics)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberMethodSymbol.LazyMethodChecks()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceEventAccessorSymbol.get_Parameters()
   at Microsoft.CodeAnalysis.CSharp.Symbols.MethodSymbol.get_ParameterCount()
   at Microsoft.CodeAnalysis.CSharp.InMethodBinder.LookupSymbolsInSingleBinder(LookupResult result, String name, Int32 arity, ConsList`1 basesBeingResolved, LookupOptions options, Binder originalBinder, Boolean diagnose, CompoundUseSiteInfo`1& useSiteInfo)
   at Microsoft.CodeAnalysis.CSharp.Binder.LookupSymbolsInternal(LookupResult result, String name, Int32 arity, ConsList`1 basesBeingResolved, LookupOptions options, Boolean diagnose, CompoundUseSiteInfo`1& useSiteInfo)
   at Microsoft.CodeAnalysis.CSharp.Binder.IdentifierUsedAsValueFinder.CheckIdentifiersInNode(CSharpSyntaxNode node, Binder binder)
   at Microsoft.CodeAnalysis.CSharp.Binder.CapturedParametersFinder.<GetCapturedParameters>g__checkParameterReferencesInMethodBody|4_2(CSharpSyntaxNode syntaxNode, Binder bodyBinder, <>c__DisplayClass4_0&)
   at Microsoft.CodeAnalysis.CSharp.Binder.CapturedParametersFinder.GetCapturedParameters(SynthesizedPrimaryConstructor primaryConstructor)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SynthesizedPrimaryConstructor.GetBackingFields()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.AddSynthesizedTypeMembersIfNecessary(MembersAndInitializersBuilder builder, DeclaredMembersAndInitializers declaredMembersAndInitializers, BindingDiagnosticBag diagnostics)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.BuildMembersAndInitializers(BindingDiagnosticBag diagnostics)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.GetMembersByNameSlow()
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceMemberContainerTypeSymbol.ForceComplete(SourceLocation locationOpt, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Symbol.ForceCompleteMemberByLocation(SourceLocation locationOpt, Symbol member, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceNamespaceSymbol.<>c__DisplayClass66_1.<ForceComplete>b__0(Int32 i)
   at Roslyn.Utilities.UICultureUtilities.<>c__DisplayClass6_0`1.<WithCurrentUICulture>b__0(T param)
   at Roslyn.Utilities.RoslynParallel.<>c__DisplayClass1_0.<For>g__errorHandlingBody|0(Int32 i)
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`2.<ForWorker>b__1(RangeWorker& currentWorker, Int64 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica.Execute()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.ThrowSingleCancellationExceptionOrOtherException(ICollection exceptions, CancellationToken cancelToken, Exception otherException)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal,TInt](TInt fromInclusive, TInt toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at Roslyn.Utilities.RoslynParallel.For(Int32 fromInclusive, Int32 toExclusive, Action`1 body, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceNamespaceSymbol.ForceComplete(SourceLocation locationOpt, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceModuleSymbol.ForceComplete(SourceLocation locationOpt, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.Symbols.SourceAssemblySymbol.ForceComplete(SourceLocation locationOpt, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetSourceDeclarationDiagnostics(SyntaxTree syntaxTree, Nullable`1 filterSpanWithinTree, Func`4 locationFilterOpt, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.CSharp.CSharpCompilation.GetDiagnosticsWithoutFiltering(CompilationStage stage, Boolean includeEarlierStages, BindingDiagnosticBag builder, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.<GetAllDiagnosticsAsync>g__getAllDiagnosticsWithoutStateTrackingAsync|35_0(ImmutableArray`1 analyzers, CancellationToken cancellationToken)
   at Microsoft.CodeAnalysis.Diagnostics.CompilationWithAnalyzers.GetAllDiagnosticsAsync(CancellationToken cancellationToken)
   at MirrorSharp.Internal.Roslyn.RoslynSession.GetDiagnosticsAsync(CancellationToken cancellationToken) in D:\a\SharpLab\SharpLab\source\#external\mirrorsharp\Common\Internal\Roslyn\RoslynSession.cs:line 99
   at MirrorSharp.Internal.Handlers.SlowUpdateHandler.ExecuteAsync(AsyncData data, WorkSession session, ICommandResultSender sender, CancellationToken cancellationToken) in D:\a\SharpLab\SharpLab\source\#external\mirrorsharp\Common\Internal\Handlers\SlowUpdateHandler.cs:line 27
   at MirrorSharp.Internal.Connection.ReceiveAndProcessInternalAsync(CancellationToken cancellationToken) in D:\a\SharpLab\SharpLab\source\#external\mirrorsharp\Common\Internal\Connection.cs:line 96
   at MirrorSharp.Internal.Connection.ReceiveAndProcessAsync(CancellationToken cancellationToken) in D:\a\SharpLab\SharpLab\source\#external\mirrorsharp\Common\Internal\Connection.cs:line 54

[jjonescz]

Looks like a duplicate of #71400, should be fixed since Visual Studio 17.10 Preview 1.