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-rw-r--r--src/libstd/at_vec.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/at_vec.rs b/src/libstd/at_vec.rs
index 42f511f722d..93a66f6d917 100644
--- a/src/libstd/at_vec.rs
+++ b/src/libstd/at_vec.rs
@@ -236,7 +236,7 @@ pub mod raw {
                 let alloc = n * (*ty).size;
                 let total_size = alloc + sys::size_of::<Vec<()>>();
                 if alloc / (*ty).size != n || total_size < alloc {
-                    fail!("vector size is too large: %u", n);
+                    fail2!("vector size is too large: {}", n);
                 }
                 (*ptr) = local_realloc(*ptr as *(), total_size) as *mut Box<Vec<()>>;
                 (**ptr).data.alloc = alloc;