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-rw-r--r--compiler/rustc_expand/src/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/rustc_expand/src/lib.rs b/compiler/rustc_expand/src/lib.rs
index 7043ad54645..86ff110eec1 100644
--- a/compiler/rustc_expand/src/lib.rs
+++ b/compiler/rustc_expand/src/lib.rs
@@ -1,4 +1,5 @@
 #![allow(rustc::potential_query_instability)]
+#![feature(array_windows)]
 #![feature(associated_type_bounds)]
 #![feature(associated_type_defaults)]
 #![feature(if_let_guard)]