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open System
 
type Attr([<ParamArray>] x: obj[]) =
  inherit Attribute()
 
[<Attr(null)>]
let f () = ()

error FS0193: internal error: not a nominal type

Unhandled Exception:
System.InvalidOperationException: not a nominal type
  at Microsoft.FSharp.Compiler.AbstractIL.IL+ILType.get_TypeSpec () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttribArg (Microsoft.FSharp.Compiler.ImportMap amap, Microsoft.FSharp.Compiler.TcGlobals g, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Expr x, Microsoft.FSharp.Compiler.AbstractIL.ILType ilArgTy) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+ilArgs@5754.Invoke (Microsoft.FSharp.Compiler.AttribExpr _arg16, Microsoft.FSharp.Compiler.AbstractIL.ILType ty) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.map2[AttribExpr,ILType,ILAttribElem] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 xs1, Microsoft.FSharp.Collections.FSharpList`1 xs2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Map2[AttribExpr,ILType,ILAttribElem] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 list1, Microsoft.FSharp.Collections.FSharpList`1 list2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttr (Microsoft.FSharp.Compiler.ImportMap amap, Microsoft.FSharp.Compiler.TcGlobals g, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Attrib _arg11) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenAttrs@5757.Invoke (Microsoft.FSharp.Compiler.Attrib arg30@) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.map[Attrib,ILAttribute] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Map[Attrib,ILAttribute] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttrs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 attrs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+ilAttrsThatGoOnPrimaryItem@5221.GenerateNext (IEnumerable`1& next) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1[Microsoft.FSharp.Compiler.AbstractIL.IL+ILAttribute].MoveNextImpl () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1[Microsoft.FSharp.Compiler.AbstractIL.IL+ILAttribute].System-Collections-IEnumerator-MoveNext () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.SeqModule.ToList[ILAttribute] (IEnumerable`1 source) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenMethodForBinding (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Val v, Microsoft.FSharp.Compiler.AbstractIL.ILMethodSpec mspec, Microsoft.FSharp.Compiler.AbstractIL.ILMemberAccess access, Microsoft.FSharp.Collections.FSharpList`1 paramInfos, Microsoft.FSharp.Compiler.ArgReprInfo retInfo, Microsoft.FSharp.Compiler.ValReprInfo topValInfo, Microsoft.FSharp.Core.FSharpOption`1 ctorThisValOpt, Microsoft.FSharp.Core.FSharpOption`1 baseValOpt, Microsoft.FSharp.Collections.FSharpList`1 tps, Microsoft.FSharp.Collections.FSharpList`1 methodVars, Microsoft.FSharp.Compiler.Expr body, Microsoft.FSharp.Compiler.TType returnTy) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenBindAfterSequencePoint (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.EmitSequencePointState sp, Microsoft.FSharp.Compiler.Binding _arg9) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenBindings@5396.Invoke (Microsoft.FSharp.Compiler.Binding bind) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[Binding] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[Binding] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenBindings (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 binds) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleBinding (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceBinding _arg12) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDef@5834-1.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceBinding arg50@) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceBinding] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceBinding] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleExpr@5814.Invoke (System.Tuple`2 scopeMarks) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.LocalScope[Unit] (System.String nm, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Core.FSharpFunc`2 f) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleExpr (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExprWithSig x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenTopImpl@5927.Invoke (Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Compiler.Ilxgen+CodeGenBuffer,Microsoft.FSharp.Compiler.Ilxgen+IlxGenEnv].InvokeFast[Unit] (Microsoft.FSharp.Core.FSharpFunc`2 func, Microsoft.FSharp.Compiler.CodeGenBuffer arg1, Microsoft.FSharp.Compiler.IlxGenEnv arg2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodeGenThen (Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Boolean zapFirstSeqPointToStart, Microsoft.FSharp.Collections.FSharpList`1 entryPointInfo, System.String methodName, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Int32 alreadyUsedArgs, Int32 alreadyUsedLocals, Microsoft.FSharp.Core.FSharpFunc`2 codeGenFunction, range m) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodeGenMethod (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Boolean zapFirstSeqPointToStart, Microsoft.FSharp.Collections.FSharpList`1 entryPointInfo, System.String methodName, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Int32 alreadyUsedArgs, Int32 alreadyUsedLocals, Microsoft.FSharp.Core.FSharpFunc`2 codeGenFunction, range m) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenTopImpl (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Microsoft.FSharp.Core.FSharpOption`1 mainInfoOpt, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.TypedImplFile _arg13) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodegenAssembly (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Microsoft.FSharp.Collections.FSharpList`1 fileImpls) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenerateCode (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.TypedAssembly _arg1, Microsoft.FSharp.Collections.FSharpList`1 assemAttribs, Microsoft.FSharp.Collections.FSharpList`1 moduleAttribs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+IlxAssemblyGenerator.GenerateCode (Microsoft.FSharp.Compiler.IlxGenOptions codeGenOpts, Microsoft.FSharp.Compiler.TypedAssembly typedAssembly, Microsoft.FSharp.Collections.FSharpList`1 assemAttribs, Microsoft.FSharp.Collections.FSharpList`1 moduleAttribs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Fscopts.GenerateIlxCode (Microsoft.FSharp.Compiler.IlxGenBackend ilxBackend, Boolean isInteractiveItExpr, Boolean isInteractiveOnMono, Microsoft.FSharp.Compiler.TcConfig tcConfig, Microsoft.FSharp.Compiler.TopAttribs topAttrs, Microsoft.FSharp.Compiler.TypedAssembly optimizedImpls, System.String fragName, Boolean netFxHasSerializableAttribute, Microsoft.FSharp.Compiler.IlxAssemblyGenerator ilxGenerator) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.main2b[ErrorLogger,String,FSharpList`1,FSharpList`1,SigningInfo,String] (Microsoft.FSharp.Compiler.Args`1 _arg1) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.typecheckAndCompile (System.String[] argv, Boolean bannerAlreadyPrinted, Exiter exiter, Microsoft.FSharp.Compiler.ErrorLoggerProvider errorLoggerProvider) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.mainCompile (System.String[] argv, Boolean bannerAlreadyPrinted, Exiter exiter) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.CommandLineMain.runMain (System.String[] argv) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.CommandLineMain.main (System.String[] argv) [0x00000] in <filename unknown>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.InvalidOperationException: not a nominal type
  at Microsoft.FSharp.Compiler.AbstractIL.IL+ILType.get_TypeSpec () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttribArg (Microsoft.FSharp.Compiler.ImportMap amap, Microsoft.FSharp.Compiler.TcGlobals g, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Expr x, Microsoft.FSharp.Compiler.AbstractIL.ILType ilArgTy) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+ilArgs@5754.Invoke (Microsoft.FSharp.Compiler.AttribExpr _arg16, Microsoft.FSharp.Compiler.AbstractIL.ILType ty) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.map2[AttribExpr,ILType,ILAttribElem] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 xs1, Microsoft.FSharp.Collections.FSharpList`1 xs2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Map2[AttribExpr,ILType,ILAttribElem] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 list1, Microsoft.FSharp.Collections.FSharpList`1 list2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttr (Microsoft.FSharp.Compiler.ImportMap amap, Microsoft.FSharp.Compiler.TcGlobals g, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Attrib _arg11) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenAttrs@5757.Invoke (Microsoft.FSharp.Compiler.Attrib arg30@) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.map[Attrib,ILAttribute] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Map[Attrib,ILAttribute] (Microsoft.FSharp.Core.FSharpFunc`2 mapping, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenAttrs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 attrs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+ilAttrsThatGoOnPrimaryItem@5221.GenerateNext (IEnumerable`1& next) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1[Microsoft.FSharp.Compiler.AbstractIL.IL+ILAttribute].MoveNextImpl () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1[Microsoft.FSharp.Compiler.AbstractIL.IL+ILAttribute].System-Collections-IEnumerator-MoveNext () [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.SeqModule.ToList[ILAttribute] (IEnumerable`1 source) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenMethodForBinding (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.Val v, Microsoft.FSharp.Compiler.AbstractIL.ILMethodSpec mspec, Microsoft.FSharp.Compiler.AbstractIL.ILMemberAccess access, Microsoft.FSharp.Collections.FSharpList`1 paramInfos, Microsoft.FSharp.Compiler.ArgReprInfo retInfo, Microsoft.FSharp.Compiler.ValReprInfo topValInfo, Microsoft.FSharp.Core.FSharpOption`1 ctorThisValOpt, Microsoft.FSharp.Core.FSharpOption`1 baseValOpt, Microsoft.FSharp.Collections.FSharpList`1 tps, Microsoft.FSharp.Collections.FSharpList`1 methodVars, Microsoft.FSharp.Compiler.Expr body, Microsoft.FSharp.Compiler.TType returnTy) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenBindAfterSequencePoint (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.EmitSequencePointState sp, Microsoft.FSharp.Compiler.Binding _arg9) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenBindings@5396.Invoke (Microsoft.FSharp.Compiler.Binding bind) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[Binding] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[Binding] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenBindings (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 binds) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleBinding (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceBinding _arg12) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDef@5834-1.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceBinding arg50@) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceBinding] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceBinding] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleDefs@5824.Invoke (Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Primitives.Basics.List.iter[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 f, Microsoft.FSharp.Collections.FSharpList`1 x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Collections.ListModule.Iterate[ModuleOrNamespaceExpr] (Microsoft.FSharp.Core.FSharpFunc`2 action, Microsoft.FSharp.Collections.FSharpList`1 list) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDefs (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Collections.FSharpList`1 mdefs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleDef (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExpr x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenModuleExpr@5814.Invoke (System.Tuple`2 scopeMarks) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.LocalScope[Unit] (System.String nm, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Core.FSharpFunc`2 f) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenModuleExpr (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.QualifiedNameOfFile qname, System.Collections.Generic.List`1 lazyInitInfo, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.ModuleOrNamespaceExprWithSig x) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+GenTopImpl@5927.Invoke (Microsoft.FSharp.Compiler.CodeGenBuffer cgbuf, Microsoft.FSharp.Compiler.IlxGenEnv eenv) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Core.FSharpFunc`2[Microsoft.FSharp.Compiler.Ilxgen+CodeGenBuffer,Microsoft.FSharp.Compiler.Ilxgen+IlxGenEnv].InvokeFast[Unit] (Microsoft.FSharp.Core.FSharpFunc`2 func, Microsoft.FSharp.Compiler.CodeGenBuffer arg1, Microsoft.FSharp.Compiler.IlxGenEnv arg2) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodeGenThen (Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Boolean zapFirstSeqPointToStart, Microsoft.FSharp.Collections.FSharpList`1 entryPointInfo, System.String methodName, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Int32 alreadyUsedArgs, Int32 alreadyUsedLocals, Microsoft.FSharp.Core.FSharpFunc`2 codeGenFunction, range m) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodeGenMethod (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Boolean zapFirstSeqPointToStart, Microsoft.FSharp.Collections.FSharpList`1 entryPointInfo, System.String methodName, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Int32 alreadyUsedArgs, Int32 alreadyUsedLocals, Microsoft.FSharp.Core.FSharpFunc`2 codeGenFunction, range m) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenTopImpl (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Microsoft.FSharp.Core.FSharpOption`1 mainInfoOpt, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.TypedImplFile _arg13) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.CodegenAssembly (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.AssemblyBuilder mgbuf, Microsoft.FSharp.Collections.FSharpList`1 fileImpls) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen.GenerateCode (Microsoft.FSharp.Compiler.cenv cenv, Microsoft.FSharp.Compiler.IlxGenEnv eenv, Microsoft.FSharp.Compiler.TypedAssembly _arg1, Microsoft.FSharp.Collections.FSharpList`1 assemAttribs, Microsoft.FSharp.Collections.FSharpList`1 moduleAttribs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Ilxgen+IlxAssemblyGenerator.GenerateCode (Microsoft.FSharp.Compiler.IlxGenOptions codeGenOpts, Microsoft.FSharp.Compiler.TypedAssembly typedAssembly, Microsoft.FSharp.Collections.FSharpList`1 assemAttribs, Microsoft.FSharp.Collections.FSharpList`1 moduleAttribs) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Fscopts.GenerateIlxCode (Microsoft.FSharp.Compiler.IlxGenBackend ilxBackend, Boolean isInteractiveItExpr, Boolean isInteractiveOnMono, Microsoft.FSharp.Compiler.TcConfig tcConfig, Microsoft.FSharp.Compiler.TopAttribs topAttrs, Microsoft.FSharp.Compiler.TypedAssembly optimizedImpls, System.String fragName, Boolean netFxHasSerializableAttribute, Microsoft.FSharp.Compiler.IlxAssemblyGenerator ilxGenerator) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.main2b[ErrorLogger,String,FSharpList`1,FSharpList`1,SigningInfo,String] (Microsoft.FSharp.Compiler.Args`1 _arg1) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.typecheckAndCompile (System.String[] argv, Boolean bannerAlreadyPrinted, Exiter exiter, Microsoft.FSharp.Compiler.ErrorLoggerProvider errorLoggerProvider) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.Driver.mainCompile (System.String[] argv, Boolean bannerAlreadyPrinted, Exiter exiter) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.CommandLineMain.runMain (System.String[] argv) [0x00000] in <filename unknown>:0 
  at Microsoft.FSharp.Compiler.CommandLineMain.main (System.String[] argv) [0x00000] in <filename unknown>:0 

Standard output is empty