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-rw-r--r--src/libstd/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 316ea65af87..71221a654e8 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -108,6 +108,7 @@
 #![feature(linkage, thread_local, asm)]
 #![feature(lang_items, unsafe_destructor)]
 #![feature(slicing_syntax, unboxed_closures)]
+#![feature(box_syntax)]
 #![feature(old_impl_check)]
 
 // Don't link to std. We are std.