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Even though we all know that this code is logically okay because all bytes in the buffer will be overwritten, LLVM posits that any reference to uninitialized memory is not allowed to exist. The mere act of creating such a reference is immediate UB.
This is actually a known issue with Rust's
Readtrait -- There is no way to safely useReadwithout initializing the buffer first, even though we all know that it's going to get overwritten.