mirror of https://github.com/rust-lang/rust
36 lines
775 B
Rust
36 lines
775 B
Rust
#![allow(unused_mut)]
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#![feature(coroutines, coroutine_trait)]
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use std::marker::Unpin;
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use std::ops::Coroutine;
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use std::ops::CoroutineState::Yielded;
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use std::pin::Pin;
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pub struct GenIter<G>(G);
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impl <G> Iterator for GenIter<G>
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where
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G: Coroutine + Unpin,
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{
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type Item = G::Yield;
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fn next(&mut self) -> Option<Self::Item> {
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match Pin::new(&mut self.0).resume(()) {
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Yielded(y) => Some(y),
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_ => None
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}
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}
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}
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fn bug<'a>() -> impl Iterator<Item = &'a str> {
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GenIter(#[coroutine] move || {
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let mut s = String::new();
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yield &s[..] //~ ERROR cannot yield value referencing local variable `s` [E0515]
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//~| ERROR borrow may still be in use when coroutine yields
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})
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}
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fn main() {
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bug();
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}
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