src/test/ui/single-use-lifetime/one-use-in-fn-return.rs

// Test that we DO NOT warn when lifetime name is used only
// once in a fn return type -- using `'_` is not legal there,
// as it must refer back to an argument.
//
// (Normally, using `'static` would be preferred, but there are
// times when that is not what you want.)

// build-pass (FIXME(62277): could be check-pass?)

#![deny(single_use_lifetimes)]

fn b<'a>() -> &'a u32 { // OK: used only in return type
    &22
}

fn main() {}