src/test/ui/borrowck/borrowck-closures-use-after-free.rs

// Tests that a closure which mutates a local variable
// cannot also be supplied a borrowed version of that
// variable's contents. Issue #11192.

#![feature(box_syntax)]

struct Foo {
  x: isize
}

impl Drop for Foo {
  fn drop(&mut self) {
    println!("drop {}", self.x);
  }
}

fn main() {
  let mut ptr: Box<_> = box Foo { x: 0 };
  let mut test = |foo: &Foo| {
    ptr = box Foo { x: ptr.x + 1 };
  };
  test(&*ptr); //~ ERROR cannot borrow `*ptr`
}