//@ edition:2021 | |
// Test that if we deref an immutable borrow to access a Place, | |
// then we can't mutate the final place. | |
fn main() { | |
let mut x = (format!(""), format!("X2")); | |
let mut y = (&x, "Y"); | |
let z = (&mut y, "Z"); | |
// `x.0` is mutable but we access `x` via `*z.0.0`, which is an immutable reference and | |
// therefore can't be mutated. | |
let mut c = || { | |
//~^ ERROR: cannot borrow `*z.0.0` as mutable, as it is behind a `&` reference | |
z.0.0.0 = format!("X1"); | |
}; | |
c(); | |
} |