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-rw-r--r--src/librustdoc/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index daa930fddcb..56f5c23f6f1 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -18,6 +18,7 @@
        html_root_url = "http://doc.rust-lang.org/nightly/",
        html_playground_url = "http://play.rust-lang.org/")]
 #![feature(slicing_syntax)]
+#![feature(box_syntax)]
 
 extern crate arena;
 extern crate getopts;