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-rw-r--r--src/libstd/lib.rs3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 82de55efad6..7304871cf21 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -105,10 +105,9 @@
        html_root_url = "http://doc.rust-lang.org/master/",
        html_playground_url = "http://play.rust-lang.org/")]
 
-#![allow(unknown_features)]
 #![feature(macro_rules, globs, managed_boxes, linkage)]
 #![feature(default_type_params, phase, lang_items, unsafe_destructor)]
-#![feature(import_shadowing, slicing_syntax)]
+#![feature(import_shadowing)]
 
 // Don't link to std. We are std.
 #![no_std]