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-rw-r--r--src/liballoc/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/liballoc/lib.rs b/src/liballoc/lib.rs
index 6399be98cd5..021395d0c82 100644
--- a/src/liballoc/lib.rs
+++ b/src/liballoc/lib.rs
@@ -96,6 +96,7 @@
 #![feature(dropck_eyepatch)]
 #![feature(exact_size_is_empty)]
 #![feature(fmt_internals)]
+#![feature(fn_must_use)]
 #![feature(from_ref)]
 #![feature(fundamental)]
 #![feature(lang_items)]