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-rw-r--r--compiler/rustc_query_system/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_query_system/src/lib.rs b/compiler/rustc_query_system/src/lib.rs
index f47760e9ae6..623be668464 100644
--- a/compiler/rustc_query_system/src/lib.rs
+++ b/compiler/rustc_query_system/src/lib.rs
@@ -3,6 +3,7 @@
 #![feature(hash_raw_entry)]
 #![feature(min_specialization)]
 #![feature(extern_types)]
+#![feature(let_chains)]
 #![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]