IronLanguages / ironpython2

.NET 6 throws ArgumentOutOfRangeException when executing the following code:

ironpython2/Src/IronPython/Runtime/Operations/ListOfTOps.cs

Lines 145 to 147 in aa0526d

    
           newData = new List<T>(icnt); 
        
           for (int i = start; i > stop; i += step) { 
        
               newData[index++] = l[i];

It seems that such code is not used in IronPython 2. I found this bug when reusing the code for a Unity IL2CPP compatible .NET Python implementation.

It seems that such code is not used in IronPython 2. I found this bug when reusing the code for a Unity IL2CPP compatible .NET Python implementation.

Indeed, looks like extended slicing doesn't work with List<T> and this code is never invoked.

Doesn't appear to be an issue with IronPython 3 (the code has changed since it split from ironpython2).

	newData = new List<T>(icnt);
	for (int i = start; i > stop; i += step) {
	newData[index++] = l[i];

indexing zero-length lists