You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: string_slice.rs
    path of file: ./repos/rust-clippy/tests/ui
    
    the code of the file until where you have to start completion: #[warn(clippy::string_slice)]
#[allow(clippy::no_effect)]

fn main() {
    &"Ölkanne"[1..];
    //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
    //~
    
fn main() {
    &"Ölkanne"[1..];
    //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
    //~| NOTE: `-D clippy::string-slice` implied by `-D warnings`
    let m = "Mötörhead";
    &m[2..5];
    //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
    let s = String::from(m);
    &s[0..2];
    //~^ ERROR: indexing into a string may panic if the index is within a UTF-8 character
}