Error code E0596
This error occurs because you tried to mutably borrow a non-mutable variable.
Erroneous code example:
#![allow(unused)] fn main() { let x = 1; let y = &mut x; // error: cannot borrow mutably }
In here, x
isn't mutable, so when we try to mutably borrow it in y
, it
fails. To fix this error, you need to make x
mutable:
#![allow(unused)] fn main() { let mut x = 1; let y = &mut x; // ok! }