Add test for const parameter type depending on type parameter

Author: varkor

src/test/ui/const_generics/const-param-type-depends-on-type-param.rs

@@ -0,0 +1,13 @@
+// Copyright 2018 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.
+
+#![crate_type = "lib"]
+
+pub struct Dependent<T, const X: T>([(); X]); //~ ERROR const parameters

src/test/ui/const_generics/const-param-type-depends-on-type-param.stderr

@@ -0,0 +1,9 @@
+error[E0668]: const parameters cannot depend on type parameters
+  --> $DIR/const-param-type-depends-on-type-param.rs:13:34
+   |
+LL | pub struct Dependent<T, const X: T>([(); X]); //~ ERROR const parameters
+   |                                  ^ const parameter depends on type parameter
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0668`.