Fix list concat overwriting #3167
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goddenrich
approved these changes
May 16, 2024
samwestmoreland
approved these changes
May 17, 2024
HartBlanc
reviewed
May 17, 2024
| @@ -363,7 +364,7 @@ func (l pyList) Operator(operator Operator, operand pyObject) pyObject { | |||
| } | |||
| panic("Cannot add list and " + operand.Type()) | |||
| } | |||
| return append(l, l2...) | |||
| return slices.Clip(append(l, l2...)) | |||
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Do we need to apply this change to the pyFrozenList case a few lines above too?
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Fixes #3166
Looks like this is due to the slices overwriting since on append they both think they have extra capacity, but are in fact sharing it. A pure Go example: https://go.dev/play/p/pLl6MlMr3V4
This fixes this particular case; I don't think there are others at present, we seem to construct lists with capacity equal to their final size in other instances.