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