Segfault on calling method on owned trait object

[benw]

This segfaults on the second call to fruit.eat():

trait Fruit {
  fn eat(&self);
}

struct Apple {
  x: int
}

impl Fruit for Apple {
  fn eat(&self) {
    println(fmt!("Crunching on apple %d", self.x));
  }
}

fn main() {
  let fruits: ~[ ~Fruit ] = ~[
    ~Apple{ x: 1 } as ~Fruit,
    ~Apple{ x: 2 } as ~Fruit,
    ~Apple{ x: 3 } as ~Fruit
  ];

  for fruits.each |fruit| {
    println(~"before");
    fruit.eat();
    println(~"after");
  }
}

Results:

> rustc --version
rustc 0.6
host: x86_64-apple-darwin
> rustc test.rs 
warning: no debug symbols in executable (-arch x86_64)
> ./test
before
Crunching on apple 1
after
before
Segmentation fault: 11

[thestinger]

Fixed by #7214.