|
//@ edition:2018
|
|
|
|
pub async fn f(x: Option<usize>) {
|
|
x.take();
|
|
//~^ ERROR cannot borrow `x` as mutable, as it is not declared as mutable [E0596]
|
|
}
|
|
|
|
pub async fn g(x: usize) {
|
|
x += 1;
|
|
//~^ ERROR cannot assign twice to immutable variable `x` [E0384]
|
|
}
|
|
|
|
fn main() {}
|