ty::ReFree(ref fr) => fr.scope,
- ty::ReStatic => {
- // If we get here, an error must have been
- // reported in
- // `lifetime::guarantee_lifetime()`, because
- // the only legal ways to have a borrow with a
- // static lifetime should not require
- // restrictions. To avoid reporting derived
- // errors, we just return here without adding
- // any loans.
- return;
- }
+ ty::ReStatic => self.item_ub,
ty::ReEmpty |
ty::ReLateBound(..) |
--- /dev/null
+// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use std::mem;
+
+fn leak<T>(mut b: Box<T>) -> &'static mut T {
+ // isn't this supposed to be safe?
+ let inner = &mut *b as *mut _;
+ mem::forget(b);
+ unsafe { &mut *inner }
+}
+
+fn evil(mut s: &'static mut String)
+{
+ // create alias
+ let alias: &'static mut String = s;
+ let inner: &str = &alias;
+ // free value
+ *s = String::new(); //~ ERROR cannot assign
+ let _spray = "0wned".to_owned();
+ // ... and then use it
+ println!("{}", inner);
+}
+
+fn main() {
+ evil(leak(Box::new("hello".to_owned())));
+}