Add tests for const exprs in fixed vec length type and vec repeat.

src/test/compile-fail/non-constant-expr-for-fixed-len-vec.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 non-constant exprs do fail as count in fixed length vec type
+
+fn main() {
+    fn bar(n: int) {
+        let _x: [int * n]; //~ ERROR expected constant expr for vector length: Non-constant path in constant expr
+    }
+}

src/test/compile-fail/non-constant-expr-for-vec-repeat.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 non constant exprs fail for vector repeat syntax
+
+fn main() {
+    fn bar(n: int) {
+        let _x = [0, ..n]; //~ ERROR expected constant integer for repeat count but found variable
+    }
+}

src/test/run-pass/const-expr-in-fixed-length-vec.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 constant expressions can be used for declaring the 
+// type of a fixed length vector.
+
+fn main() {
+
+    const FOO: int = 2;
+    let _v: [int * FOO*3];
+
+}

src/test/run-pass/const-expr-in-vec-repeat.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 constant expressions can be used in vec repeat syntax. 
+
+fn main() {
+
+    const FOO: int = 2;
+    let _v = [0, ..FOO*3*2/2];
+
+}