Auto merge of #26734 - Gankro:deprecate-vecmap, r=alexcrichton

VecMap doesn't really fit with the current standard library's strategy (small!).

I've mirrored the code to https://github.com/contain-rs/vec-map

but @GBGamer has already claimed the name on crates.io a couple months ago for the same purpose. It hasn't been updated since, though.

CC @rust-lang/libs

src/libcollections/lib.rs

@@ -87,6 +87,7 @@ pub use enum_set::EnumSet;
 pub use vec_deque::VecDeque;
 pub use string::String;
 pub use vec::Vec;
+#[allow(deprecated)]
 pub use vec_map::VecMap;
 
 // Needed for the vec! macro
@@ -108,6 +109,7 @@ pub mod str;
 pub mod string;
 pub mod vec;
 pub mod vec_deque;
+#[allow(deprecated)]
 pub mod vec_map;
 
 #[unstable(feature = "bitvec", reason = "RFC 509")]

src/libcollections/vec_map.rs

@@ -11,9 +11,12 @@
 //! A simple map based on a vector for small integer keys. Space requirements
 //! are O(highest integer key).
 
+#![deprecated(reason = "VecMap moved to crates.io as vec_map",
+              since = "1.3.0")]
+#![unstable(feature = "vecmap", reason = "deprecated")]
+#![allow(deprecated)]
+
 #![allow(missing_docs)]
-#![unstable(feature = "vecmap",
-            reason = "may not be stabilized in the standard library")]
 
 use self::Entry::*;
 

src/libserialize/collection_impls.rs

@@ -8,6 +8,9 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// VecMap
+#![allow(deprecated)]
+
 //! Implementations of serialization for structures found in libcollections
 
 use std::usize;