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-rw-r--r--src/libregex/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libregex/lib.rs b/src/libregex/lib.rs
index bd376528a0e..d19ce3b460a 100644
--- a/src/libregex/lib.rs
+++ b/src/libregex/lib.rs
@@ -25,6 +25,7 @@
 
 #![allow(unknown_features)]
 #![feature(slicing_syntax)]
+#![feature(box_syntax)]
 #![deny(missing_docs)]
 
 #[cfg(test)]