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A yield expression was used outside of the coroutine literal.
Erroneous code example:
```compile_fail,E0627
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
fn fake_coroutine() -> &'static str {
yield 1;
return "foo"
}
fn main() {
let mut coroutine = fake_coroutine;
}
```
The error occurs because keyword `yield` can only be used inside the coroutine
literal. This can be fixed by constructing the coroutine correctly.
```
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
fn main() {
let mut coroutine = #[coroutine] || {
yield 1;
return "foo"
};
}
```
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