std: Deprecate the `future` feature

This commit deprecates the `sync::Future` type to be developed outside in
crates.io instead.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/libstd/sync/future.rs b/src/libstd/sync/future.rs
index f5b6650a498..e3ddc1034a5 100644
--- a/src/libstd/sync/future.rs
+++ b/src/libstd/sync/future.rs
@@ -32,6 +32,10 @@
             reason = "futures as-is have yet to be deeply reevaluated with recent \
                       core changes to Rust's synchronization story, and will likely \
                       become stable in the future but are unstable until that time")]
+#[deprecated(since = "1.2.0",
+             reason = "implementation does not match the quality of the \
+                       standard library and this will likely be prototyped \
+                       outside in crates.io first")]
 
 use core::prelude::*;
 use core::mem::replace;