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-rw-r--r--compiler/rustc_data_structures/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_data_structures/src/lib.rs b/compiler/rustc_data_structures/src/lib.rs
index 426d2c4034b..004017ec5f3 100644
--- a/compiler/rustc_data_structures/src/lib.rs
+++ b/compiler/rustc_data_structures/src/lib.rs
@@ -31,6 +31,7 @@
 #![feature(unwrap_infallible)]
 #![feature(strict_provenance)]
 #![feature(ptr_alignment_type)]
+#![feature(macro_metavar_expr)]
 #![allow(rustc::default_hash_types)]
 #![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]