rustNew error in Rust

The new error in Rust is the E0308 error. This error occurs when a variable is declared as mutable but not actually used as mutable.

Here is an example of code that would cause this error:

let mut x = 5;
x = 6;

The output of this code would be:

error[E0308]: mismatched types
  --> src/main.rs:2:5
   |
2  |     x = 6;
   |     ^^^^^ expected mutable, found immutable

Explanation of code parts:

1. let mut x = 5; - This line declares a mutable variable x and assigns it the value of 5.
2. x = 6; - This line attempts to reassign the value of x to 6.

This code will cause the E0308 error because the variable x was declared as mutable but not used as mutable. To fix this error, the variable x must be used as mutable by adding the mut keyword before it:

let mut x = 5;
x = 6; // No error

Helpful links:

1. Rust Error E0308
2. Rust Mutability

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