Merge pull request #128 from sunjay/allow-stable-features

Allow stable features + a note about why

Author: nikomatsakis

chalk-engine/src/lib.rs

@@ -51,12 +51,17 @@
 
 #![feature(crate_in_paths)]
 #![feature(crate_visibility_modifier)]
-#![feature(dyn_trait)]
 #![feature(in_band_lifetimes)]
 #![feature(macro_vis_matcher)]
 #![feature(step_trait)]
 #![feature(non_modrs_mods)]
 
+//FIXME(2018-05-14): In rustc we build using beta and dyn trait is still unstable right now, so we
+// need to allow this to remove the warning about dyn_trait being stable in the latest rust.
+// We should probably eventually remove this `allow` and delete any unecessary `feature` declarations.
+#![allow(stable_features)]
+#![feature(dyn_trait)]
+
 #[macro_use] extern crate chalk_macros;
 extern crate stacker;
 extern crate fxhash;