Rollup merge of rust-lang#59675 - SimonSapin:stable-alloc, r=alexcrichton

Stabilize the `alloc` crate.

This implements RFC 2480:

* rust-lang/rfcs#2480
* https://github.com/rust-lang/rfcs/blob/master/text/2480-liballoc.md

Closes rust-lang#27783

Author: Centril

src/liballoc/lib.rs

@@ -51,10 +51,7 @@
 //! default global allocator. It is not compatible with the libc allocator API.
 
 #![allow(unused_attributes)]
-#![unstable(feature = "alloc",
-            reason = "this library is unlikely to be stabilized in its current \
-                      form or name",
-            issue = "27783")]
+#![stable(feature = "alloc", since = "1.36.0")]
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/",
        issue_tracker_base_url = "https://github.com/rust-lang/rust/issues/",
        test(no_crate_inject, attr(allow(unused_variables), deny(warnings))))]

src/liballoc/prelude/mod.rs

@@ -5,7 +5,6 @@
 //!
 //! ```
 //! # #![allow(unused_imports)]
-//! # #![feature(alloc)]
 //! #![feature(alloc_prelude)]
 //! extern crate alloc;
 //! use alloc::prelude::v1::*;

src/liballoc/raw_vec.rs

@@ -256,7 +256,7 @@ impl<T, A: Alloc> RawVec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(alloc, raw_vec_internals)]
+    /// # #![feature(raw_vec_internals)]
     /// # extern crate alloc;
     /// # use std::ptr;
     /// # use alloc::raw_vec::RawVec;
@@ -460,7 +460,7 @@ impl<T, A: Alloc> RawVec<T, A> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(alloc, raw_vec_internals)]
+    /// # #![feature(raw_vec_internals)]
     /// # extern crate alloc;
     /// # use std::ptr;
     /// # use alloc::raw_vec::RawVec;

src/libarena/lib.rs

@@ -14,7 +14,6 @@
 #![deny(rust_2018_idioms)]
 #![cfg_attr(not(stage0), deny(internal))]
 
-#![feature(alloc)]
 #![feature(core_intrinsics)]
 #![feature(dropck_eyepatch)]
 #![feature(raw_vec_internals)]

src/libpanic_unwind/lib.rs

@@ -19,8 +19,6 @@
 
 #![deny(rust_2018_idioms)]
 
-#![feature(allocator_api)]
-#![feature(alloc)]
 #![feature(core_intrinsics)]
 #![feature(lang_items)]
 #![feature(libc)]

src/libstd/lib.rs

@@ -229,7 +229,6 @@
 #![feature(align_offset)]
 #![feature(alloc_error_handler)]
 #![feature(alloc_layout_extra)]
-#![feature(alloc)]
 #![feature(allocator_api)]
 #![feature(allocator_internals)]
 #![feature(allow_internal_unsafe)]

src/test/run-make-fulldeps/sysroot-crates-are-unstable/test.py

@@ -7,8 +7,8 @@
 
 # This is a whitelist of files which are stable crates or simply are not crates,
 # we don't check for the instability of these crates as they're all stable!
-STABLE_CRATES = ['std', 'core', 'proc_macro', 'rsbegin.o', 'rsend.o', 'dllcrt2.o', 'crt2.o',
-                 'clang_rt']
+STABLE_CRATES = ['std', 'alloc', 'core', 'proc_macro',
+                 'rsbegin.o', 'rsend.o', 'dllcrt2.o', 'crt2.o', 'clang_rt']
 
 
 def convert_to_string(s):

src/test/run-pass/array-slice-vec/vec-macro-no-std.rs

@@ -2,7 +2,7 @@
 
 // ignore-emscripten no no_std executables
 
-#![feature(lang_items, start, rustc_private, alloc)]
+#![feature(lang_items, start, rustc_private)]
 #![no_std]
 
 extern crate std as other;

src/test/run-pass/extern/extern-prelude-core.rs

@@ -1,5 +1,5 @@
 // run-pass
-#![feature(extern_prelude, lang_items, start, alloc)]
+#![feature(extern_prelude, lang_items, start)]
 #![no_std]
 
 extern crate std as other;

src/test/run-pass/extern/extern-prelude-core.stderr

@@ -1,7 +1,7 @@
 warning: the feature `extern_prelude` has been stable since 1.30.0 and no longer requires an attribute to enable
   --> $DIR/extern-prelude-core.rs:2:12
    |
-LL | #![feature(extern_prelude, lang_items, start, alloc)]
+LL | #![feature(extern_prelude, lang_items, start)]
    |            ^^^^^^^^^^^^^^
    |
    = note: #[warn(stable_features)] on by default