Version 1.10.0 (2016-07-07)

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

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.