rust/tests/ui/generator/issue-44197.rs
2023-01-11 09:32:08 +00:00

37 lines
745 B
Rust

// run-pass
#![feature(generators, generator_trait)]
use std::ops::{Generator, GeneratorState};
use std::pin::Pin;
fn foo(_: &str) -> String {
String::new()
}
fn bar(baz: String) -> impl Generator<(), Yield = String, Return = ()> {
move || {
yield foo(&baz);
}
}
fn foo2(_: &str) -> Result<String, ()> {
Err(())
}
fn bar2(baz: String) -> impl Generator<(), Yield = String, Return = ()> {
move || {
if let Ok(quux) = foo2(&baz) {
yield quux;
}
}
}
fn main() {
assert_eq!(
Pin::new(&mut bar(String::new())).resume(()),
GeneratorState::Yielded(String::new())
);
assert_eq!(Pin::new(&mut bar2(String::new())).resume(()), GeneratorState::Complete(()));
}