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by TheCycoONE
1603 days ago
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Because the compiler makes assumptions on the valid layouts of a type, e.g. packing Option<bool> in a single byte. Prior to 2018 it was assumed the UB was only on read like C but that turned out not to be the case. To avoid this the type has to reflect that it might be uninitialized - hence the transparent MaybeUnit wrapper. |
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