Rust 1.10.0

Language

• Copy types are required to have a trivial implementation of Clone. RFC 1521.
• Single-variant enums support the #[repr(..)] attribute.
• Fix #[derive(RustcEncodable)] in the presence of other encode methods.
• panic! can be converted to a runtime abort with the -C panic=abort flag. RFC 1513.
• Add a new crate type, 'cdylib'. cdylibs are dynamic libraries suitable for loading by non-Rust hosts. RFC 1510. Note that Cargo does not yet directly support cdylibs.

Stabilized APIs

• os::windows::fs::OpenOptionsExt::access_mode
• os::windows::fs::OpenOptionsExt::share_mode
• os::windows::fs::OpenOptionsExt::custom_flags
• os::windows::fs::OpenOptionsExt::attributes
• os::windows::fs::OpenOptionsExt::security_qos_flags
• os::unix::fs::OpenOptionsExt::custom_flags
• sync::Weak::new
• Default for sync::Weak
• panic::set_hook
• panic::take_hook
• panic::PanicInfo
• panic::PanicInfo::payload
• panic::PanicInfo::location
• panic::Location
• panic::Location::file
• panic::Location::line
• ffi::CStr::from_bytes_with_nul
• ffi::CStr::from_bytes_with_nul_unchecked
• ffi::FromBytesWithNulError
• fs::Metadata::modified
• fs::Metadata::accessed
• fs::Metadata::created
• sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange
• sync::atomic::Atomic{Usize,Isize,Bool,Ptr}::compare_exchange_weak
• collections::{btree,hash}_map::{Occupied,Vacant,}Entry::key
• os::unix::net::{UnixStream, UnixListener, UnixDatagram, SocketAddr}
• SocketAddr::is_unnamed
• SocketAddr::as_pathname
• UnixStream::connect
• UnixStream::pair
• UnixStream::try_clone
• UnixStream::local_addr
• UnixStream::peer_addr
• UnixStream::set_read_timeout
• UnixStream::set_write_timeout
• UnixStream::read_timeout
• UnixStream::write_timeout
• UnixStream::set_nonblocking
• UnixStream::take_error
• UnixStream::shutdown
• Read/Write/RawFd impls for UnixStream
• UnixListener::bind
• UnixListener::accept
• UnixListener::try_clone
• UnixListener::local_addr
• UnixListener::set_nonblocking
• UnixListener::take_error
• UnixListener::incoming
• RawFd impls for UnixListener
• UnixDatagram::bind
• UnixDatagram::unbound
• UnixDatagram::pair
• UnixDatagram::connect
• UnixDatagram::try_clone
• UnixDatagram::local_addr
• UnixDatagram::peer_addr
• UnixDatagram::recv_from
• UnixDatagram::recv
• UnixDatagram::send_to
• UnixDatagram::send
• UnixDatagram::set_read_timeout
• UnixDatagram::set_write_timeout
• UnixDatagram::read_timeout
• UnixDatagram::write_timeout
• UnixDatagram::set_nonblocking
• UnixDatagram::take_error
• UnixDatagram::shutdown
• RawFd impls for UnixDatagram
• {BTree,Hash}Map::values_mut
• <[_]>::binary_search_by_key

Libraries

• The abs_sub method of floats is deprecated. The semantics of this minor method are subtle and probably not what most people want.
• Add implementation of Ord for Cell and RefCell where T: Ord.
• On Linux, if HashMaps can't be initialized with getrandom they will fall back to /dev/urandom temporarily to avoid blocking during early boot.
• Implemented negation for wrapping numerals.
• Implement Clone for binary_heap::IntoIter.
• Implement Display and Hash for std::num::Wrapping.
• Add Default implementation for &CStr, CString.
• Implement From<Vec<T>> and Into<Vec<T>> for VecDeque<T>.
• Implement Default for UnsafeCell, fmt::Error, Condvar, Mutex, RwLock.

Cargo

• Cargo.toml supports the profile.*.panic option. This controls the runtime behavior of the panic! macro and can be either "unwind" (the default), or "abort". RFC 1513.
• Don't throw away errors with -p arguments.
• Report status to stderr instead of stdout.
• Build scripts are passed a CARGO_MANIFEST_LINKS environment variable that corresponds to the links field of the manifest.
• Ban keywords from crate names.
• Canonicalize CARGO_HOME on Windows.
• Retry network requests. By default they are retried twice, which can be customized with the net.retry value in .cargo/config.
• Don't print extra error info for failing subcommands.
• Add --force flag to cargo install.
• Don't use flock on NFS mounts.
• Prefer building cargo install artifacts in temporary directories. Makes it possible to install multiple crates in parallel.
• Add cargo test --doc.
• Add cargo --explain.
• Don't print warnings when -q is passed.
• Add cargo doc --lib and --bin.
• Don't require build script output to be UTF-8.
• Correctly attempt multiple git usernames.

Performance

• rustc memory usage was reduced by refactoring the context used for type checking.
• Speed up creation of HashMaps by caching the random keys used to initialize the hash state.
• The find implementation for Chain iterators is 2x faster.
• Trait selection optimizations speed up type checking by 15%.
• Efficient trie lookup for boolean Unicode properties. 10x faster than the previous lookup tables.
• Special case #[derive(Copy, Clone)] to avoid bloat.

Usability

• Many incremental improvements to documentation and rustdoc.
• rustdoc: List blanket trait impls.
• rustdoc: Clean up ABI rendering.
• Indexing with the wrong type produces a more informative error.
• Improve diagnostics for constants being used in irrefutable patterns.
• When many method candidates are in scope limit the suggestions to 10.
• Remove confusing suggestion when calling a fn type.
• Do not suggest changing &mut self to &mut mut self.

Misc

• Update i686-linux-android features to match Android ABI.
• Update aarch64-linux-android features to match Android ABI.
• std no longer prints backtraces on platforms where the running module must be loaded with env::current_exe, which can't be relied on.
• This release includes std binaries for the i586-unknown-linux-gnu, i686-unknown-linux-musl, and armv7-linux-androideabi targets. The i586 target is for old x86 hardware without SSE2, and the armv7 target is for Android running on modern ARM architectures.
• The rust-gdb and rust-lldb scripts are distributed on all Unix platforms.
• On Unix the runtime aborts by calling libc::abort instead of generating an illegal instruction.
• Rust is now bootstrapped from the previous release of Rust, instead of a snapshot from an arbitrary commit.

Compatibility Notes

• AtomicBool is now bool-sized, not word-sized.
• target_env for Linux ARM targets is just gnu, not gnueabihf, gnueabi, etc.
• Consistently panic on overflow in Duration::new.
• Change String::truncate to panic less.
• Add :block to the follow set for :ty and :path. Affects how macros are parsed.
• Fix macro hygiene bug.
• Feature-gated attributes on macro-generated macro invocations are now rejected.
• Suppress fallback and ambiguity errors during type inference. This caused some minor changes to type inference.