Translate MIR Repeat (arrays)

src/librustc_trans/trans/mir/rvalue.rs

@@ -49,8 +49,14 @@ impl<'bcx, 'tcx> MirContext<'bcx, 'tcx> {
                 unimplemented!()
             }
 
-            mir::Rvalue::Repeat(..) => {
-                unimplemented!()
+            mir::Rvalue::Repeat(ref elem, ref count) => {
+                let elem = self.trans_operand(bcx, elem);
+                let size = self.trans_operand(bcx, count);
+                let base = expr::get_dataptr(bcx, lldest);
+                tvec::iter_vec_raw(bcx, base, elem.ty, size.llval, |b, vref, _| {
+                    build::Store(b, elem.llval, vref);
+                    b
+                })
             }
 
             mir::Rvalue::Aggregate(_, ref operands) => {

src/test/run-pass/mir_trans_array.rs

@@ -0,0 +1,21 @@
+// 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.
+#![feature(rustc_attrs)]
+
+#[rustc_mir]
+fn into_inner() -> [u64; 1024] {
+    let mut x = 10 + 20;
+    [x; 1024]
+}
+
+fn main(){
+    let x: &[u64] = &[30; 1024];
+    assert_eq!(&into_inner()[..], x);
+}