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-rw-r--r--src/libcore/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcore/lib.rs b/src/libcore/lib.rs
index 59a296c2a76..447e144bf0f 100644
--- a/src/libcore/lib.rs
+++ b/src/libcore/lib.rs
@@ -92,6 +92,7 @@
 #![feature(unwind_attributes)]
 #![feature(doc_spotlight)]
 #![feature(rustc_const_unstable)]
+#![feature(iterator_repeat_with)]
 
 #[prelude_import]
 #[allow(unused)]