`System.Xml.XPath.XDocumentExtensions+XDocumentNavigable.CreateNavigator` fails to decompile.

[teo-tsirpanis]

Input code

ilspy-dll.zip

You can also use stock System.Xml.XPath.XDocument.dll from the .NET shared framework (tested with .NET 10 and 11).

The exception reproduces when viewing any individual member of the XDocumentNavigable class in the decompiler. It does not reproduce when decompiling the whole class.

Erroneous output

Error decompiling @06000003 System.Xml.XPath.XDocumentExtensions.XDocumentNavigable.CreateNavigator
in assembly "C:\Program Files\dotnet\shared\Microsoft.NETCore.App\10.0.10\System.Xml.XPath.XDocument.dll"
 ---> System.InvalidOperationException: Nullable object must have a value.
   at System.ThrowHelper.ThrowInvalidOperationException_InvalidOperation_NoValue() in offset 10
   at System.Nullable`1.get_Value() in offset 8
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext, ExtensionInfo extensionInfo) in CSharpDecompiler.cs:line 2036
-- continuing with outer exception (ICSharpCode.Decompiler.DecompilerException) --
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext, ExtensionInfo extensionInfo) in CSharpDecompiler.cs:line 2113
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(IMethod method, DecompileRun decompileRun, ITypeResolveContext decompilationContext, ExtensionInfo extensionInfo) in CSharpDecompiler.cs:line 1953
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.Decompile(IEnumerable`1 definitions) in CSharpDecompiler.cs:line 1259
   at ICSharpCode.ILSpy.CSharpLanguage.DecompileMethod(IMethod method, ITextOutput output, DecompilationOptions options) in offset 0
   at ICSharpCode.ILSpy.TextView.DecompilerTextView.<>c__DisplayClass58_0.<DecompileAsync>b__0() in offset 35

Details

• Product in use: ILSpy
• Version in use: 10.1.1.8388+1377eb6e7351b21112858c8c1df39848f40181ec
• It throws only when setting language version to C# 14 and above.

[teo-tsirpanis]

Thanks @siegfriedpammer!