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-rw-r--r--src/librustc_trans/lib.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/librustc_trans/lib.rs b/src/librustc_trans/lib.rs
index 3497ff2221c..5da51697d2f 100644
--- a/src/librustc_trans/lib.rs
+++ b/src/librustc_trans/lib.rs
@@ -23,8 +23,10 @@
       html_favicon_url = "http://www.rust-lang.org/favicon.ico",
       html_root_url = "http://doc.rust-lang.org/nightly/")]
 
+#![allow(unknown_features)]
 #![feature(quote)]
 #![feature(slicing_syntax, unsafe_destructor)]
+#![feature(box_syntax)]
 #![feature(rustc_diagnostic_macros)]
 
 extern crate arena;