add test for tuple index op error span

Author: oli-obk

src/test/compile-fail/const-tup-index-span.rs

@@ -0,0 +1,18 @@
+// Copyright 2015 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.
+
+// Test spans of errors
+
+const TUP: (usize,) = 5 << 64;
+//~^ ERROR: attempted left shift with overflow [E0250]
+const ARR: [i32; TUP.0] = [];
+
+fn main() {
+}