Auto merge of #79650 - the8472:fix-take, r=dtolnay

Fix incorrect io::Take's limit resulting from io::copy specialization

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.

0 files changed, 0 insertions, 0 deletions