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-rw-r--r--src/libcore/lib.rs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index ea697ed769d..d4ca5e3f8dc 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -64,6 +64,8 @@
 #![feature(unboxed_closures)]
 #![allow(unknown_features)] #![feature(int_uint)]
 #![feature(on_unimplemented)]
+// FIXME(#21363) remove `old_impl_check` when bug is fixed
+#![feature(old_impl_check)]
 #![deny(missing_docs)]
 
 #[macro_use]
@@ -137,6 +139,7 @@ pub mod slice;
 pub mod str;
 pub mod hash;
 pub mod fmt;
+pub mod error;
 
 // note: does not need to be public
 mod tuple;