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-rw-r--r--src/libfmt_macros/lib.rs7
1 files changed, 3 insertions, 4 deletions
diff --git a/src/libfmt_macros/lib.rs b/src/libfmt_macros/lib.rs
index 9bc7acb67ad..8a473ad43af 100644
--- a/src/libfmt_macros/lib.rs
+++ b/src/libfmt_macros/lib.rs
@@ -16,7 +16,6 @@
 
 #![crate_name = "fmt_macros"]
 #![unstable(feature = "rustc_private")]
-#![feature(staged_api)]
 #![staged_api]
 #![crate_type = "rlib"]
 #![crate_type = "dylib"]
@@ -25,10 +24,10 @@
        html_root_url = "http://doc.rust-lang.org/nightly/",
        html_playground_url = "http://play.rust-lang.org/")]
 
+#![cfg_attr(stage0, feature(core))]
+#![feature(int_uint)]
 #![feature(slicing_syntax)]
-#![allow(unknown_features)] #![feature(int_uint)]
-#![feature(collections)]
-#![feature(core)]
+#![feature(staged_api)]
 #![feature(unicode)]
 
 pub use self::Piece::*;