leo/docs/error-guides/parser/let_mut_statement.md
2022-02-28 09:42:37 -08:00

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# `let mut` is deprecated
## Example
This error occurs when a variable declaration is marked with `mut`.
Erroneous code example:
```js
function main() {
let mut x = 0;
}
```
The compiler will reject this code with, for example...:
```js
Error [EPAR0370015]: let mut = ... is deprecated. `let` keyword implies mutabality by default.
--> test.leo:2:5
|
2 | let mut x = 0;
| ^^^^^^^
```
## Solution
As the `mut` modifier is implicitly assumed, the solution is to remove the `mut` modifier:
```js
function main() {
let x = 0;
}
```