| An immutable variable was reassigned. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0384 |
| fn main() { |
| let x = 3; |
| x = 5; // error, reassignment of immutable variable |
| } |
| ``` |
| |
| By default, variables in Rust are immutable. To fix this error, add the keyword |
| `mut` after the keyword `let` when declaring the variable. For example: |
| |
| ``` |
| fn main() { |
| let mut x = 3; |
| x = 5; |
| } |
| ``` |
| |
| Alternatively, you might consider initializing a new variable: either with a new |
| bound name or (by [shadowing]) with the bound name of your existing variable. |
| For example: |
| |
| [shadowing]: https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html#shadowing |
| |
| ``` |
| fn main() { |
| let x = 3; |
| let x = 5; |
| } |
| ``` |
