From c87f6d854b6d75c3cc742bf78036d81e121a2be0 Mon Sep 17 00:00:00 2001
From: Venkata Giri Reddy <venkatagirireddy@gmail.com>
Date: Thu, 25 May 2017 00:21:20 -0600
Subject: [PATCH] regression test for #39974

closes #39974

r? @Mark-Simulacrum
---
 src/test/compile-fail/issue-39974.rs | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 src/test/compile-fail/issue-39974.rs

diff --git a/src/test/compile-fail/issue-39974.rs b/src/test/compile-fail/issue-39974.rs
new file mode 100644
index 0000000000000..6f6b775a2a3c6
--- /dev/null
+++ b/src/test/compile-fail/issue-39974.rs
@@ -0,0 +1,21 @@
+// Copyright 2017 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.
+
+const LENGTH: f64 = 2;
+
+struct Thing {
+    f: [[f64; 2]; LENGTH],
+    //~^ ERROR mismatched types
+    //~| expected usize, found f64
+}
+
+fn main() {
+    let _t = Thing { f: [[0.0, 0.0], [0.0, 0.0], [0.0, 0.0], [0.0, 0.0]] };
+}