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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 80629162854..6da7ec40f34 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -19,6 +19,7 @@
 
 #![allow(unknown_features)]
 #![feature(globs, macro_rules, phase, slicing_syntax)]
+#![feature(unboxed_closures)]
 
 extern crate arena;
 extern crate getopts;