1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
#![allow(unused_mut)]
#![feature(generators, generator_trait)]
use std::marker::Unpin;
use std::ops::Generator;
use std::ops::GeneratorState::Yielded;
use std::pin::Pin;
pub struct GenIter<G>(G);
impl <G> Iterator for GenIter<G>
where
G: Generator + Unpin,
{
type Item = G::Yield;
fn next(&mut self) -> Option<Self::Item> {
match Pin::new(&mut self.0).resume(()) {
Yielded(y) => Some(y),
_ => None
}
}
}
fn bug<'a>() -> impl Iterator<Item = &'a str> {
GenIter(move || {
let mut s = String::new();
yield &s[..] //~ ERROR cannot yield value referencing local variable `s` [E0515]
//~| ERROR borrow may still be in use when generator yields
})
}
fn main() {
bug();
}
|
