Add test for #2989

Author: brson

src/test/run-pass/issue-2989.rs

@@ -0,0 +1,33 @@
+use std;
+
+trait methods {
+    fn to_bytes() -> ~[u8];
+}
+
+impl (): methods {
+    fn to_bytes() -> ~[u8] {
+        vec::from_elem(0, 0)
+    }
+}
+
+// the position of this function is significant! - if it comes before methods
+// then it works, if it comes after it then it doesnt!
+fn to_bools(bitv: {storage: ~[u64]}) -> ~[bool] {
+    vec::from_fn(8, |i| {
+        let w = i / 64;
+        let b = i % 64;
+        let x = 1u64 & (bitv.storage[w] >> b);
+        x == 1u64
+    })
+}
+
+fn main() {
+    let bools = ~[false, false, true, false, false, true, true, false];
+    let bools2 = to_bools({storage: ~[0b01100100]});
+
+    for uint::range(0, 8) |i| {
+        io::println(#fmt("%u => %u vs %u", i, bools[i] as uint, bools2[i] as uint));
+    }
+
+    assert bools == bools2;
+}