Getting a warning on an empty line after updating to 0.7

[AutomatedTester]

I have just updated to 0.7 and getting the following

☁ rust_learning rustc --test about_arrays.rs
about_arrays.rs:1:0: 1:0 warning: static constant should have an uppercase identifier [-W non-uppercase-statics (default)]
about_arrays.rs:1
^
warning: no debug symbols in executable (-arch x86_64)

#[test]
fn test_we_can_get_item_from_array() {
    let foo = ["a","b","5"];
    assert!("5" == foo[2]);
}

#[test]
fn test_we_add_a_new_item_to_an_array() {
    let mut foo = ~[];
    foo.push(1);
    foo.push(3);
    foo.push(2);
    foo.push(5);
    assert!(foo.len() == 4);
}

#[test]
fn test_we_can_pop_items_from_list() {
    let mut foo = ~["a", "b", "c"];
    foo.pop();
    assert!(foo.len() == 2);
    assert!(~["a", "b"] == foo);
}

#[test]
fn test_that_we_can_slice_arrays() {
    let foo = ["a", "b", "c"];
    assert!(["c"] == foo.slice(2, 3));
}

[AutomatedTester]

cc @huonw