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#![feature(coroutine_trait)]
#![feature(coroutines, stmt_expr_attributes)]
#![deny(unused_braces, unused_parens)]
use std::ops::Coroutine;
use std::pin::Pin;
fn main() {
let mut x = #[coroutine] |_| {
while let Some(_) = (yield) {}
while let Some(_) = {yield} {}
// Only warn these cases
while let Some(_) = ({yield}) {} //~ ERROR: unnecessary parentheses
while let Some(_) = ((yield)) {} //~ ERROR: unnecessary parentheses
{{yield}}; //~ ERROR: unnecessary braces
{( yield )}; //~ ERROR: unnecessary parentheses
while let Some(_) = {(yield)} {} //~ ERROR: unnecessary parentheses
while let Some(_) = {{yield}} {} //~ ERROR: unnecessary braces
// FIXME: It'd be great if we could also warn them.
((yield));
({ yield });
};
let _ = Pin::new(&mut x).resume(Some(5));
}
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