I'm reading the lifetime misconceptions article, and it has this example:

// no relationship between input & output lifetimes
fn overlap<'a>(s: &str, t: &str) -> &'a str; 
// expands to:
fn overlap<'a, 'b, 'c>(s: &'a str, t: &'b str) -> &'c str;

I wonder how I would write or use such a function. If the output lifetime is not 'static and not determined by the inputs, where would it be coming from? Can someone give an example situation that uses such a function?

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