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-rw-r--r--src/test/bench/sudoku.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/test/bench/sudoku.rs b/src/test/bench/sudoku.rs
index 85e8288b5cd..786bbdfc803 100644
--- a/src/test/bench/sudoku.rs
+++ b/src/test/bench/sudoku.rs
@@ -10,6 +10,7 @@
 
 // ignore-pretty very bad with line comments
 
+#![feature(box_syntax)]
 #![allow(non_snake_case)]
 
 use std::io::BufferedReader;