The trait bound is not satisfied in Rust

Question

I\'m trying to write a Tic Tac Toe game in Rust, but this function for changing a field doesn\'t work and I don\'t know what\'s wrong with it:

fn change_fie         


        

Answer 1

The reason is given to you in the notes:

note: slice indices are of type `usize`

slice indices are of type `usize` or ranges of `usize`

You need to cast the i32 value to usize, for example:

table[(field - 1) as usize]

Alternatively, consider using usize as the type of the field variable, if it makes sense in your application.