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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 6187593afd1..848d3604953 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -107,6 +107,7 @@
 #![feature(macro_rules, globs, linkage, thread_local, asm)]
 #![feature(default_type_params, phase, lang_items, unsafe_destructor)]
 #![feature(slicing_syntax, unboxed_closures)]
+#![feature(old_orphan_check)]
 
 // Don't link to std. We are std.
 #![no_std]