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diff --git a/src/test/compile-fail/const-len-underflow-separate-spans.rs b/src/test/compile-fail/const-len-underflow-separate-spans.rs
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+++ b/src/test/compile-fail/const-len-underflow-separate-spans.rs
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+// 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), while also providing the
+// overall context for what caused the evaluation.
+
+const ONE: usize = 1;
+const TWO: usize = 2;
+const LEN: usize = ONE - TWO;
+//~^ ERROR array length constant evaluation error: attempted to sub with overflow [E0250]
+
+fn main() {
+    let a: [i8; LEN] = unimplemented!();
+    //~^ NOTE for array length here
+}