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-rw-r--r--src/liballoc/lib.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 811e32e747d..47715fe9e5d 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -70,6 +70,8 @@
 #![feature(lang_items, unsafe_destructor)]
 #![feature(box_syntax)]
 #![feature(optin_builtin_traits)]
+// FIXME(#21363) remove `old_impl_check` when bug is fixed
+#![feature(old_impl_check)]
 #![allow(unknown_features)] #![feature(int_uint)]
 
 #[macro_use]