tests/ui/generator/yield-while-local-borrowed.rs

   1 #![feature(generators, generator_trait)]
   2
   3 use std::ops::{GeneratorState, Generator};
   4 use std::cell::Cell;
   5 use std::pin::Pin;
   6
   7 fn borrow_local_inline() {
   8     // Not OK to yield with a borrow of a temporary.
   9     //
  10     // (This error occurs because the region shows up in the type of
  11     // `b` and gets extended by region inference.)
  12     let mut b = move || {
  13         let a = &mut 3;
  14         //~^ ERROR borrow may still be in use when generator yields
  15         yield();
  16         println!("{}", a);
  17     };
  18     Pin::new(&mut b).resume(());
  19 }
  20
  21 fn borrow_local_inline_done() {
  22     // No error here -- `a` is not in scope at the point of `yield`.
  23     let mut b = move || {
  24         {
  25             let a = &mut 3;
  26         }
  27         yield();
  28     };
  29     Pin::new(&mut b).resume(());
  30 }
  31
  32 fn borrow_local() {
  33     // Not OK to yield with a borrow of a temporary.
  34     //
  35     // (This error occurs because the region shows up in the type of
  36     // `b` and gets extended by region inference.)
  37     let mut b = move || {
  38         let a = 3;
  39         {
  40             let b = &a;
  41             //~^ ERROR borrow may still be in use when generator yields
  42             yield();
  43             println!("{}", b);
  44         }
  45     };
  46     Pin::new(&mut b).resume(());
  47 }
  48
  49 fn main() { }