Auto merge of #21892 - huonw:deprecate-rand, r=alexcrichton

Use [`rand`](https://crates.io/crates/rand) and [`derive_rand`](https://crates.io/crates/derive_rand) from crates.io.

[breaking-change]

Author: bors

src/etc/generate-deriving-span-tests.py

@@ -114,8 +114,7 @@ def write_file(name, string):
     'Encodable': (0, [], 0), # FIXME: quoting gives horrible spans
 }
 
-for (trait, supers, errs) in [('Rand', [], 1),
-                              ('Clone', [], 1),
+for (trait, supers, errs) in [('Clone', [], 1),
                               ('PartialEq', [], 2),
                               ('PartialOrd', ['PartialEq'], 8),
                               ('Eq', ['PartialEq'], 1),

src/libcollections/lib.rs

@@ -32,6 +32,7 @@
 #![feature(unicode)]
 #![feature(unsafe_destructor, slicing_syntax)]
 #![cfg_attr(test, feature(test))]
+#![cfg_attr(test, allow(deprecated))] // rand
 
 #![no_std]
 

src/libcoretest/lib.rs

@@ -12,6 +12,7 @@
 #![feature(int_uint)]
 #![feature(unboxed_closures)]
 #![feature(unsafe_destructor, slicing_syntax)]
+#![allow(deprecated)] // rand
 
 extern crate core;
 extern crate test;

src/libflate/lib.rs

@@ -130,6 +130,7 @@ pub fn inflate_bytes_zlib(bytes: &[u8]) -> Option<Bytes> {
 
 #[cfg(test)]
 mod tests {
+    #![allow(deprecated)]
     use super::{inflate_bytes, deflate_bytes};
     use std::rand;
     use std::rand::Rng;

src/librand/lib.rs

@@ -28,6 +28,10 @@
 #![feature(staged_api)]
 #![staged_api]
 #![feature(core)]
+#![deprecated(reason = "use the crates.io `rand` library instead",
+              since = "1.0.0-alpha")]
+
+#![allow(deprecated)]
 
 #[macro_use]
 extern crate core;

src/librustc_back/sha2.rs

@@ -528,6 +528,7 @@ static H256: [u32; 8] = [
 
 #[cfg(test)]
 mod tests {
+    #![allow(deprecated)]
     extern crate rand;
 
     use self::rand::Rng;

src/libstd/collections/hash/map.rs

@@ -1593,6 +1593,7 @@ pub struct RandomState {
 impl RandomState {
     /// Construct a new `RandomState` that is initialized with random keys.
     #[inline]
+    #[allow(deprecated)]
     pub fn new() -> RandomState {
         let mut r = rand::thread_rng();
         RandomState { k0: r.gen(), k1: r.gen() }

src/libstd/lib.rs

@@ -140,7 +140,7 @@ extern crate core;
 #[macro_reexport(vec)]
 extern crate "collections" as core_collections;
 
-extern crate "rand" as core_rand;
+#[allow(deprecated)] extern crate "rand" as core_rand;
 extern crate alloc;
 extern crate unicode;
 extern crate libc;

src/libstd/num/strconv.rs

@@ -459,6 +459,7 @@ mod tests {
 
 #[cfg(test)]
 mod bench {
+    #![allow(deprecated)] // rand
     extern crate test;
 
     mod uint {

src/libstd/old_io/fs.rs

@@ -822,6 +822,7 @@ fn access_string(access: FileAccess) -> &'static str {
 #[allow(unused_imports)]
 #[allow(unused_variables)]
 #[allow(unused_mut)]
+#[allow(deprecated)] // rand
 mod test {
     use prelude::v1::*;
     use old_io::{SeekSet, SeekCur, SeekEnd, Read, Open, ReadWrite, FileType};

src/libstd/old_io/tempfile.rs

@@ -9,6 +9,7 @@
 // except according to those terms.
 
 //! Temporary files and directories
+#![allow(deprecated)] // rand
 
 use env;
 use iter::{IteratorExt};

src/libstd/os.rs

@@ -1422,6 +1422,8 @@ mod arch_consts {
 
 #[cfg(test)]
 mod tests {
+    #![allow(deprecated)] // rand
+
     use prelude::v1::*;
 
     use iter::repeat;

src/libstd/rand/mod.rs

@@ -220,6 +220,9 @@
 //! ```
 
 #![unstable(feature = "rand")]
+#![deprecated(reason = "use the crates.io `rand` library instead",
+              since = "1.0.0-alpha")]
+#![allow(deprecated)]
 
 use cell::RefCell;
 use clone::Clone;

src/libstd/sync/rwlock.rs

@@ -383,6 +383,8 @@ impl<'a, T> Drop for RwLockWriteGuard<'a, T> {
 
 #[cfg(test)]
 mod tests {
+    #![allow(deprecated)] // rand
+
     use prelude::v1::*;
 
     use rand::{self, Rng};

src/libsyntax/ext/deriving/rand.rs

@@ -24,6 +24,10 @@ pub fn expand_deriving_rand<F>(cx: &mut ExtCtxt,
                                push: F) where
     F: FnOnce(P<Item>),
 {
+    cx.span_warn(span,
+                 "`#[derive(Rand)]` is deprecated in favour of `#[derive_Rand]` from \
+                  `rand_macros` on crates.io");
+
     let trait_def = TraitDef {
         span: span,
         attributes: Vec::new(),

src/test/compile-fail/deriving-span-Rand-enum-struct-variant.rs

@@ -12,6 +12,7 @@
 
 #![deny(unused_extern_crates)]
 #![allow(unused_variables)]
+#![allow(deprecated)]
 #![feature(libc)]
 #![feature(collections)]
 #![feature(rand)]

src/test/compile-fail/deriving-span-Rand-enum.rs

@@ -15,7 +15,6 @@
 #![feature(trace_macros, concat_idents)]
 
 #[derive(Default, //~ ERROR
-           Rand, //~ ERROR
            Zero)] //~ ERROR
 enum CantDeriveThose {}