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-rw-r--r--src/libfmt_macros/lib.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/libfmt_macros/lib.rs b/src/libfmt_macros/lib.rs
index 39f130b82ed..f1c2b1fb871 100644
--- a/src/libfmt_macros/lib.rs
+++ b/src/libfmt_macros/lib.rs
@@ -13,6 +13,7 @@
 
 #![feature(nll)]
 #![feature(rustc_private)]
+#![feature(unicode_internals)]
 
 pub use Piece::*;
 pub use Position::*;