Rename the feature gate for alloc::prelude

… to separate it from that of the crate.

New tracking issue: #58935

Author: SimonSapin

src/liballoc/prelude/mod.rs

@@ -6,10 +6,11 @@
 //! ```
 //! # #![allow(unused_imports)]
 //! # #![feature(alloc)]
+//! #![feature(alloc_prelude)]
 //! extern crate alloc;
 //! use alloc::prelude::v1::*;
 //! ```
 
-#![unstable(feature = "alloc", issue = "27783")]
+#![unstable(feature = "alloc_prelude", issue = "58935")]
 
 pub mod v1;

src/liballoc/prelude/v1.rs

@@ -2,10 +2,10 @@
 //!
 //! See the [module-level documentation](../index.html) for more.
 
-#![unstable(feature = "alloc", issue = "27783")]
+#![unstable(feature = "alloc_prelude", issue = "58935")]
 
-#[unstable(feature = "alloc", issue = "27783")] pub use crate::borrow::ToOwned;
-#[unstable(feature = "alloc", issue = "27783")] pub use crate::boxed::Box;
-#[unstable(feature = "alloc", issue = "27783")] pub use crate::slice::SliceConcatExt;
-#[unstable(feature = "alloc", issue = "27783")] pub use crate::string::{String, ToString};
-#[unstable(feature = "alloc", issue = "27783")] pub use crate::vec::Vec;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::borrow::ToOwned;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::boxed::Box;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::slice::SliceConcatExt;
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::string::{String, ToString};
+#[unstable(feature = "alloc_prelude", issue = "58935")] pub use crate::vec::Vec;