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