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-rw-r--r--library/alloc/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index 4e812529c2c..afc3a3dc6a8 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -125,6 +125,7 @@
 #![feature(hasher_prefixfree_extras)]
 #![feature(inline_const)]
 #![feature(inplace_iteration)]
+#![cfg_attr(test, feature(is_sorted))]
 #![feature(iter_advance_by)]
 #![feature(iter_next_chunk)]
 #![feature(iter_repeat_n)]