Move std::io::BufRead to alloc::io#158546
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Used to work around `Cursor` not being a fundamental type when implementing `Write` for `Cursor<Vec<u8>>` and other `alloc` types once `Cursor` and `Write` are both located in `core`.
Call to `<&mut [u8] as Write>::write` inlined as `Write` trait not yet moved into `core`.
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ACP: rust-lang/libs-team#755
Tracking issue: #154046
Split From: #156527
Blocked On: #158545
Description
Moves
std::io::BufReadtoalloc::io. This is effectively a direct cut and paste, but with a large diff due to how many implementations need to be moved intoalloc. Blocked on #158545.Notes
alloc::ioandcore::io#154046 (comment) for a review order and broader context for this PR.