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-rw-r--r--compiler/rustc_mir_build/src/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/rustc_mir_build/src/lib.rs b/compiler/rustc_mir_build/src/lib.rs
index e55180ff4be..714041ad4e8 100644
--- a/compiler/rustc_mir_build/src/lib.rs
+++ b/compiler/rustc_mir_build/src/lib.rs
@@ -1,7 +1,7 @@
 //! Construction of MIR from HIR.
 //!
 //! This crate also contains the match exhaustiveness and usefulness checking.
-
+#![feature(array_windows)]
 #![feature(box_patterns)]
 #![feature(box_syntax)]
 #![feature(const_fn)]