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indexing zero-length lists #813

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indexing zero-length lists#813

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@thautwarm
thautwarm
opened on Mar 30, 2022

.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];

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  1. thautwarm commented on Mar 30, 2022

    @thautwarm
    thautwarm
    on Mar 30, 2022
    Author

    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.

  2. slozier commented on Mar 30, 2022

    @slozier
    slozier
    on Mar 30, 2022
    Contributor

    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).

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