Add a regression test for the const eval type resolution

Author: oli-obk

src/test/run-pass/ctfe/assoc-const.rs

@@ -0,0 +1,28 @@
+// 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.
+
+trait Nat {
+    const VALUE: usize;
+}
+
+struct Zero;
+struct Succ<N>(N);
+
+impl Nat for Zero {
+    const VALUE: usize = 0;
+}
+
+impl<N: Nat> Nat for Succ<N> {
+    const VALUE: usize = N::VALUE + 1;
+}
+
+fn main() {
+    let x: [i32; <Succ<Succ<Succ<Succ<Zero>>>>>::VALUE] = [1, 2, 3, 4];
+}