| // Copyright 2016 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. |
| |
| // Test closure that: |
| // |
| // - captures a variable `y` by reference |
| // - stores that reference to `y` into another, longer-lived place (`p`) |
| // |
| // Both of these are upvars of reference type (the capture of `y` is |
| // of type `&'a i32`, the capture of `p` is of type `&mut &'b |
| // i32`). The closure thus computes a relationship between `'a` and |
| // `'b`. This relationship is propagated to the closure creator, |
| // which reports an error. |
| |
| // compile-flags:-Zborrowck=mir -Zverbose |
| |
| #![feature(rustc_attrs)] |
| |
| #[rustc_regions] |
| fn test() { |
| let x = 44; |
| let mut p = &x; |
| |
| { |
| let y = 22; |
| let mut closure = || p = &y; |
| //~^ ERROR `y` does not live long enough [E0597] |
| closure(); |
| } |
| |
| deref(p); |
| } |
| |
| fn deref(_p: &i32) { } |
| |
| fn main() { } |
