src/test/ui/nll/generator-distinct-lifetime.rs

   1 // Copyright 2017 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 #![feature(generators, nll)]
  12
  13 // Test for issue #47189. Here, both `s` and `t` are live for the
  14 // generator's lifetime, but within the generator they have distinct
  15 // lifetimes. We accept this code -- even though the borrow extends
  16 // over a yield -- because the data that is borrowed (`*x`) is not
  17 // stored on the stack.
  18
  19 // compile-pass
  20
  21 fn foo(x: &mut u32) {
  22     move || {
  23         let s = &mut *x;
  24         yield;
  25         *s += 1;
  26
  27         let t = &mut *x;
  28         yield;
  29         *t += 1;
  30     };
  31 }
  32
  33 fn main() {
  34     foo(&mut 0);
  35 }