gistfile1.rs

struct Foo {
    bar: ~[int]
}

fn main() {
    let mut foo = Foo { bar: ~[0i] };
    foo.bar = append_one(foo.bar, 1);
}

gistfile2.txt

test.rs:8:4: 8:7 error: use of partially moved value: `foo`
test.rs:8     foo.bar = append_one(foo.bar, 1);
              ^~~
test.rs:8:25: 8:32 note: `foo.bar` moved here because it has type `~[int]`, which is moved by default (use `copy` to override)
test.rs:8     foo.bar = append_one(foo.bar, 1);
                                   ^~~~~~~
error: aborting due to previous error