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-rw-r--r--src/libsyntax/lib.rs3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index 64dedd45923..a4271544146 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -23,8 +23,7 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/master/")]
 
-#![allow(unknown_features)]
-#![feature(macro_rules, globs, default_type_params, phase, slicing_syntax)]
+#![feature(macro_rules, globs, default_type_params, phase)]
 #![feature(quote, struct_variant, unsafe_destructor, import_shadowing)]
 #![allow(deprecated)]