Code shared from the Rust Playground

playground.rs

fn mock<T: Into<String>, I: IntoIterator<Item = T>>(_: I) {}

struct Merchant<'a> {
    name: &'a str,
    billing_portal: &'a str,
    billing_period: &'a str,
    stripe_id: Option<&'a str>,
}
fn merchant() -> Merchant { unimplemented!(); }

fn run() {
    let merch = merchant();
    mock(&[&merch.name, &merch.billing_portal, &merch.billing_period, &merch.stripe_id])
}