Control usage of `!` through a feature gate.

[rust.git] / src / libcore / lib.rs

diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index fabb3900ec6483be59ef239c86eed6202c15d68b..74ef378f23d90f0a69af5a79b6dd682f33eaeaa2 100644 (file)
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -87,6 +87,7 @@
 #![feature(staged_api)]
 #![feature(unboxed_closures)]
 #![feature(question_mark)]
+#![cfg_attr(not(stage0), feature(bang_type))]
 
 #[macro_use]
 mod macros;