Fix LINQ Last() in ConcatNIterator to also check base case (Concat2Iterator) #108486
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dotnet-policy-service
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This was referenced Oct 2, 2024
rameel
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Oct 3, 2024
jeffhandley
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Oct 8, 2024
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Thank you, @andrewjsaid!
This looks good to me, but I'd like @krwq or @eiriktsarpalis to review as well before merge. Once the fix is merged, we'll backport this to .NET 9 as well.
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@andrewjsaid thanks for the contribution! Have you perhaps checked if other APIs in the speed optimizations might have similar issues? (i.e. TryGetFirst or similar) |
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@krwq You're welcome. Yes I did check and it looks like |
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/backport to release/9.0 |
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Started backporting to release/9.0: https://github.com/dotnet/runtime/actions/runs/11239355958 |
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fixes #108477
ConcatNIterator.PreviousNreturnsnullin the base case as_tailisConcat2Iterator. I've copied theConcatNIterator<TSource>? node, previousN = this;pattern used in other methods over to here and added test cases