let mut variable: Type;
loop {
    variable = value;
}

or

loop {
    let variable: Type = value;
}
  • @[email protected]English
    13•2 days ago

    Functionally equivalent, the compiler will optimize lots for you. As the programmer, your focus should be on whether that variable is relevant to the loop’s scope exclusively or not (i.e. if you need to access the variable after the loop has modified it). If not, keep it in the loop so that its easier to read your code.