Stabilize alloc feature

Author: taiki-e

.travis.yml

@@ -25,7 +25,7 @@ matrix:
 
     # When updating this, the reminder to update the minimum required version in README.md.
     - name: cargo test (minimum required version)
-      rust: nightly-2019-04-13
+      rust: nightly-2019-04-14
 
     - name: cargo clippy
       rust: nightly

README.md

@@ -39,7 +39,7 @@ Now, you can use futures-rs:
 use futures::future::Future; // Note: It's not `futures_preview`
 ```
 
-The current version of futures-rs requires Rust nightly 2019-02-15 or later.
+The current version of futures-rs requires Rust nightly 2019-04-14 or later.
 
 ### Feature `std`
 

futures-core/src/lib.rs

@@ -2,7 +2,6 @@
 
 #![feature(futures_api)]
 #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
-#![cfg_attr(all(feature = "alloc", not(feature = "std")), feature(alloc))]
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
@@ -13,13 +12,8 @@
 #[cfg(all(feature = "cfg-target-has-atomic", not(feature = "nightly")))]
 compile_error!("The `cfg-target-has-atomic` feature requires the `nightly` feature as an explicit opt-in to unstable features");
 
-#[cfg(all(feature = "alloc", not(any(feature = "std", feature = "nightly"))))]
-compile_error!("The `alloc` feature without `std` requires the `nightly` feature active to explicitly opt-in to unstable features");
-
-#[cfg(all(feature = "alloc", not(feature = "std")))]
+#[cfg(feature = "alloc")]
 extern crate alloc;
-#[cfg(feature = "std")]
-extern crate std as alloc;
 
 pub mod future;
 #[doc(hidden)] pub use self::future::{Future, FusedFuture, TryFuture};

futures-sink/src/lib.rs

@@ -8,15 +8,9 @@
 #![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.13/futures_sink")]
 
 #![feature(futures_api)]
-#![cfg_attr(all(feature = "alloc", not(feature = "std")), feature(alloc))]
 
-#[cfg(all(feature = "alloc", not(any(feature = "std", feature = "nightly"))))]
-compile_error!("The `alloc` feature without `std` requires the `nightly` feature active to explicitly opt-in to unstable features");
-
-#[cfg(all(feature = "alloc", not(feature = "std")))]
+#[cfg(feature = "alloc")]
 extern crate alloc;
-#[cfg(feature = "std")]
-extern crate std as alloc;
 
 use futures_core::task::{Context, Poll};
 use core::pin::Pin;

futures-util/src/lib.rs

@@ -5,7 +5,6 @@
 #![cfg_attr(feature = "alloc", feature(box_into_pin))]
 #![cfg_attr(feature = "std", feature(async_await, await_macro))]
 #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
-#![cfg_attr(all(feature = "alloc", not(feature = "std")), feature(alloc))]
 
 #![cfg_attr(not(feature = "std"), no_std)]
 #![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
@@ -15,13 +14,8 @@
 #[cfg(all(feature = "cfg-target-has-atomic", not(feature = "nightly")))]
 compile_error!("The `cfg-target-has-atomic` feature requires the `nightly` feature as an explicit opt-in to unstable features");
 
-#[cfg(all(feature = "alloc", not(any(feature = "std", feature = "nightly"))))]
-compile_error!("The `alloc` feature without `std` requires the `nightly` feature active to explicitly opt-in to unstable features");
-
-#[cfg(all(feature = "alloc", not(feature = "std")))]
+#[cfg(feature = "alloc")]
 extern crate alloc;
-#[cfg(feature = "std")]
-extern crate std as alloc;
 
 #[macro_use]
 mod macros;

futures/src/lib.rs

@@ -23,7 +23,6 @@
 
 #![feature(futures_api)]
 #![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]
-#![cfg_attr(all(feature = "alloc", not(feature = "std")), feature(alloc))]
 
 #![cfg_attr(not(feature = "std"), no_std)]
 
@@ -34,9 +33,6 @@
 #[cfg(all(feature = "cfg-target-has-atomic", not(feature = "nightly")))]
 compile_error!("The `cfg-target-has-atomic` feature requires the `nightly` feature as an explicit opt-in to unstable features");
 
-#[cfg(all(feature = "alloc", not(any(feature = "std", feature = "nightly"))))]
-compile_error!("The `alloc` feature without `std` requires the `nightly` feature active to explicitly opt-in to unstable features");
-
 #[doc(hidden)] pub use futures_util::core_reexport;
 
 #[doc(hidden)] pub use futures_core::future::Future;