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-rw-r--r--compiler/rustc_mir_transform/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_mir_transform/src/lib.rs b/compiler/rustc_mir_transform/src/lib.rs
index d968a488519..40dc9fe9a05 100644
--- a/compiler/rustc_mir_transform/src/lib.rs
+++ b/compiler/rustc_mir_transform/src/lib.rs
@@ -1,6 +1,6 @@
 #![allow(rustc::potential_query_instability)]
 #![feature(box_patterns)]
-#![feature(let_chains)]
+#![cfg_attr(bootstrap, feature(let_chains))]
 #![feature(let_else)]
 #![feature(map_try_insert)]
 #![feature(min_specialization)]