Document Rust's stance on `/proc/self/mem` Add documentation to `std::os::unix::io` describing Rust's stance on `/proc/self/mem`, treating it as an external entity which is outside the scope of Rust's safety guarantees.
HashMap::drain
Ipv6Addr::to_ipv4_mapped
unused_macro_rules
#[rustc_deprecated]
Path::try_exists()
lazy::Sync{OnceCell,Lazy}
sync::{Once,Lazy}Lock
ce1151c04c