1 files changed, 20 insertions, 0 deletions
diff --git a/src/test/compile-fail/const-len-underflow-subspans.rs b/src/test/compile-fail/const-len-underflow-subspans.rs
new file mode 100644
index 00000000000..a31da114679
--- /dev/null
+++ b/src/test/compile-fail/const-len-underflow-subspans.rs
@@ -0,0 +1,20 @@
+// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// Check that an constant-evaluation underflow highlights the correct
+// spot (where the underflow occurred).
+
+const ONE: usize = 1;
+const TWO: usize = 2;
+
+fn main() {
+    let a: [i8; ONE - TWO] = unimplemented!();
+    //~^ ERROR array length constant evaluation error: attempted to sub with overflow [E0250]
+}