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-rw-r--r--src/libsyntax/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
index d5093c5055c..7a6824ac27c 100644
--- a/src/libsyntax/lib.rs
+++ b/src/libsyntax/lib.rs
@@ -26,6 +26,7 @@
 #![feature(macro_rules, globs, default_type_params, phase, slicing_syntax)]
 #![feature(quote, unsafe_destructor)]
 #![feature(unboxed_closures)]
+#![feature(old_orphan_check)]
 
 extern crate arena;
 extern crate fmt_macros;