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Fix incorrect io::Take's limit resulting from io::copy specialization by the8472...
source link: https://github.com/rust-lang/rust/pull/79650
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the8472 commented 17 days ago
The specialization introduced in #75272 fails to update io::Take wrappers after performing the copy syscalls which bypass those wrappers. The buffer flushing before the copy does update them correctly, but the bytes copied after the initial flush weren't subtracted.
The fix is to subtract the bytes copied from each Take in the chain of wrappers, even when an error occurs during the syscall loop. To do so the CopyResult enum now has to carry the bytes copied so far in the error case.
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