Add some simple tests for move.

src/test/compile-fail/move-not-variable.rs

@@ -0,0 +1,4 @@
+fn main() {
+    auto x;
+    x <- 5;
+}

src/test/run-pass/move-1.rs

@@ -0,0 +1,21 @@
+use std;
+import std::uint;
+
+fn test(bool x, @tup(int, int, int) foo) -> int {
+    auto bar = foo;
+    let @tup(int,int,int) y;
+    if (x) {
+        y <- bar;
+    } else {
+        y = @tup(4,5,6);
+    }
+    ret y._1;
+}
+
+fn main() {
+    auto x = @tup(1,2,3);
+    assert (test(true, x) == 2);
+    assert (test(true, x) == 2);
+    assert (test(true, x) == 2);
+    assert (test(false, x) == 5);
+}