76 lines
1.7 KiB
Rust
76 lines
1.7 KiB
Rust
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
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use std::ops::{CoroutineState, Coroutine};
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use std::cell::Cell;
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use std::pin::Pin;
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fn yield_during_iter_owned_data(x: Vec<i32>) {
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// The coroutine owns `x`, so we error out when yielding with a
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// reference to it. This winds up becoming a rather confusing
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// regionck error -- in particular, we would freeze with the
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// reference in scope, and it doesn't live long enough.
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let _b =#[coroutine] move || {
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for p in &x { //~ ERROR
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yield();
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}
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};
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}
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fn yield_during_iter_borrowed_slice(x: &[i32]) {
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let _b = #[coroutine] move || {
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for p in x {
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yield();
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}
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};
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}
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fn yield_during_iter_borrowed_slice_2() {
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let mut x = vec![22_i32];
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let _b = #[coroutine] || {
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for p in &x {
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yield();
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}
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};
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println!("{:?}", x);
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}
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fn yield_during_iter_borrowed_slice_3() {
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// OK to take a mutable ref to `x` and yield
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// up pointers from it:
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let mut x = vec![22_i32];
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let mut b = #[coroutine] || {
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for p in &mut x {
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yield p;
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}
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};
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Pin::new(&mut b).resume(());
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}
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fn yield_during_iter_borrowed_slice_4() {
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// ...but not OK to do that while reading
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// from `x` too
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let mut x = vec![22_i32];
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let mut b = #[coroutine] || {
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for p in &mut x {
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yield p;
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}
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};
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println!("{}", x[0]); //~ ERROR
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Pin::new(&mut b).resume(());
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}
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fn yield_during_range_iter() {
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// Should be OK.
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let mut b = #[coroutine] || {
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let v = vec![1,2,3];
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let len = v.len();
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for i in 0..len {
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let x = v[i];
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yield x;
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}
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};
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Pin::new(&mut b).resume(());
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}
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fn main() { }
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