System.InvalidOperationException: inst is not an assignment! in DeconstructInstruction.CheckInvariant

[yyjdelete]

Steps to reproduce

1. Compile the below code and view Class1.<Test1>d__1.MoveNext() in C# or IL with C# mode. Seems

public class Class1
{
	public (int, int) Test2()
	{
		return default((int, int));
	}

	public async Task<int> Test1(string file)
	{
		int a = 0;
		int b = 0;
		await Task.Run(delegate
		{
			(a, b) = Test2();
		});
		return a + b;
	}
}

Error message shown

Error decompiling @0600000A Class1.<Test1>d__1.MoveNext
in assembly "F:\z1\bin\Release\net8.0\z1.dll"
 ---> System.InvalidOperationException: inst is not an assignment!
   at ICSharpCode.Decompiler.IL.DeconstructInstruction.CheckInvariant(ILPhase phase) in DeconstructInstruction.cs:line 298
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.Block.CheckInvariant(ILPhase phase) in Block.cs:line 108
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.BlockContainer.CheckInvariant(ILPhase phase) in BlockContainer.cs:line 196
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.ILFunction.CheckInvariant(ILPhase phase) in ILFunction.cs:line 260
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.CallInstruction.CheckInvariant(ILPhase phase) in CallInstruction.cs:line 123
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.CallInstruction.CheckInvariant(ILPhase phase) in CallInstruction.cs:line 123
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.StLoc.CheckInvariant(ILPhase phase) in StLoc.cs:line 41
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.Block.CheckInvariant(ILPhase phase) in Block.cs:line 108
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.IfInstruction.CheckInvariant(ILPhase phase) in IfInstruction.cs:line 58
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.Block.CheckInvariant(ILPhase phase) in Block.cs:line 108
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.BlockContainer.CheckInvariant(ILPhase phase) in BlockContainer.cs:line 196
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.Block.CheckInvariant(ILPhase phase) in Block.cs:line 108
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.BlockContainer.CheckInvariant(ILPhase phase) in BlockContainer.cs:line 196
   at ICSharpCode.Decompiler.IL.ILInstruction.CheckInvariant(ILPhase phase) in ILInstruction.cs:line 95
   at ICSharpCode.Decompiler.IL.ILFunction.CheckInvariant(ILPhase phase) in ILFunction.cs:line 260
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1721
-- continuing with outer exception (ICSharpCode.Decompiler.DecompilerException) --
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DecompileBody(IMethod method, EntityDeclaration entityDecl, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1756
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(IMethod method, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1605
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.<>c__DisplayClass74_0.<DoDecompile>g__DoDecompileMember|0(IEntity entity, RecordDecompiler recordDecompiler, PartialTypeInfo partialType) in CSharpDecompiler.cs:line 1480
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.DoDecompile(ITypeDefinition typeDef, DecompileRun decompileRun, ITypeResolveContext decompilationContext) in CSharpDecompiler.cs:line 1369
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.Decompile(IEnumerable`1 definitions) in CSharpDecompiler.cs:line 1034
   at ICSharpCode.Decompiler.CSharp.CSharpDecompiler.Decompile(EntityHandle[] definitions) in CSharpDecompiler.cs:line 1006
   at ICSharpCode.ILSpy.CSharpLanguage.DecompileType(ITypeDefinition type, ITextOutput output, DecompilationOptions options) in CSharpLanguage.cs:line 334
   at ICSharpCode.ILSpy.TreeNodes.TypeTreeNode.Decompile(Language language, ITextOutput output, DecompilationOptions options) in TypeTreeNode.cs:line 132
   at ICSharpCode.ILSpy.TextView.DecompilerTextView.DecompileNodes(DecompilationContext context, ITextOutput textOutput) in DecompilerTextView.cs:line 914
   at ICSharpCode.ILSpy.TextView.DecompilerTextView.<>c__DisplayClass52_0.<DecompileAsync>b__0() in DecompilerTextView.cs:line 884

Details

• Product in use: ILSpy
• Version in use: 8.0.0.7444(last CI build)

[siegfriedpammer]

I tried reproducing this using latest master, but cannot reproduce it anymore. Also tried 8.0.0.7444, but could not reproduce the problem.

[siegfriedpammer]

Reproducible in IL with C# mode, sorry for the confusion.