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-rw-r--r--src/libcollectionstest/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libcollectionstest/lib.rs b/src/libcollectionstest/lib.rs
index d4fb5ea03ad..ee555ee351e 100644
--- a/src/libcollectionstest/lib.rs
+++ b/src/libcollectionstest/lib.rs
@@ -11,6 +11,7 @@
 #![deny(warnings)]
 
 #![feature(binary_heap_extras)]
+#![feature(binary_heap_peek_mut_pop)]
 #![feature(box_syntax)]
 #![feature(btree_range)]
 #![feature(collections)]