From ad8a19c7ff9fce503c6457acff29705f2d6c28b9 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Wed, 7 Nov 2018 16:13:51 -0800
Subject: [PATCH] Update no_std support.

---
 lib/preopt/src/lib.rs | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/lib/preopt/src/lib.rs b/lib/preopt/src/lib.rs
index bf2ffc1a8c..789b308afb 100644
--- a/lib/preopt/src/lib.rs
+++ b/lib/preopt/src/lib.rs
@@ -1,12 +1,8 @@
 //! Performes early-stage optimizations on Cranelift IR.
 
-#![deny(
-    missing_docs,
-    trivial_numeric_casts,
-    unused_extern_crates,
-    unstable_features
-)]
+#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates,)]
 #![warn(unused_import_braces)]
+#![cfg_attr(feature = "std", deny(unstable_features))]
 #![cfg_attr(
     feature = "clippy",
     plugin(clippy(conf_file = "../../clippy.toml"))
@@ -29,7 +25,7 @@
     )
 )]
 #![cfg_attr(not(feature = "std"), no_std)]
-#![cfg_attr(not(feature = "std"), alloc)]
+#![cfg_attr(not(feature = "std"), feature(alloc))]
 
 #[cfg(not(feature = "std"))]
 extern crate alloc;