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-rw-r--r--compiler/rustc_traits/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_traits/src/lib.rs b/compiler/rustc_traits/src/lib.rs
index 0da28737f69..0ffa92f1ad5 100644
--- a/compiler/rustc_traits/src/lib.rs
+++ b/compiler/rustc_traits/src/lib.rs
@@ -3,6 +3,7 @@
 
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
+#![feature(let_chains)]
 #![recursion_limit = "256"]
 
 #[macro_use]