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-rw-r--r--library/core/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/library/core/src/lib.rs b/library/core/src/lib.rs
index 5a6d242a729..5bb7101a403 100644
--- a/library/core/src/lib.rs
+++ b/library/core/src/lib.rs
@@ -219,6 +219,7 @@
 #![feature(doc_cfg)]
 #![feature(doc_cfg_hide)]
 #![feature(doc_notable_trait)]
+#![feature(effects)]
 #![feature(exhaustive_patterns)]
 #![feature(extern_types)]
 #![feature(fundamental)]