Log Message:
Update to 1.25.0

Changelog:
Version 1.25.0 (2018-03-29)
Language

    Stabilised #[repr(align(x))]. RFC 1358
    You can now use nested groups of imports. e.g. use std::{fs::File, io::Read, \ 
path::{Path, PathBuf}};
    You can now have | at the start of a match arm. e.g.

enum Foo { A, B, C }

fn main() {
    let x = Foo::A;
    match x {
        | Foo::A
        | Foo::B => println!("AB"),
        | Foo::C => println!("C"),
    }
}

Compiler

    Upgraded to LLVM 6.
    Added -C lto=val option.
    Added i586-unknown-linux-musl target

Libraries

    Impl Send for process::Command on Unix.
    Impl PartialEq and Eq for ParseCharError.
    UnsafeCell::into_inner is now safe.
    Implement libstd for CloudABI.
    Float::{from_bits, to_bits} is now available in libcore.
    Implement AsRef<Path> for Component
    Implemented Write for Cursor<&mut Vec<u8>>
    Moved Duration to libcore.

Stabilized APIs

    Location::column
    ptr::NonNull

The following functions can now be used in a constant expression. eg. static \ 
MINUTE: Duration = Duration::from_secs(60);

    Duration::new
    Duration::from_secs
    Duration::from_millis

Cargo

    cargo new no longer removes rust or rs prefixs/suffixs.
    cargo new now defaults to creating a binary crate, instead of a library crate.

Misc

    Rust by example is now shipped with new releases

Compatibility Notes

    Deprecated net::lookup_host.
    rustdoc has switched to pulldown as the default markdown renderer.
    The borrow checker was sometimes incorrectly permitting overlapping borrows \ 
around indexing operations (see #47349). This has been fixed (which also enabled \ 
some correct code that used to cause errors (e.g. #33903 and #46095).
    Removed deprecated unstable attribute #[simd].