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More than one parameter was used for a coroutine.
Erroneous code example:
```compile_fail,E0628
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
fn main() {
let coroutine = #[coroutine] |a: i32, b: i32| {
// error: too many parameters for a coroutine
// Allowed only 0 or 1 parameter
yield a;
};
}
```
At present, it is not permitted to pass more than one explicit
parameter for a coroutine.This can be fixed by using
at most 1 parameter for the coroutine. For example, we might resolve
the previous example by passing only one parameter.
```
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
fn main() {
let coroutine = #[coroutine] |a: i32| {
yield a;
};
}
```
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