// This test checks that the error messages you get for this example // at least mention `'a` and `'static`. The precise messages can drift // over time, but this test used to exhibit some pretty bogus messages // that were not remotely helpful. //@ error-pattern:argument requires that `'a` must outlive `'static` struct Invariant<'a>(Option<&'a mut &'a mut ()>); fn mk_static() -> Invariant<'static> { Invariant(None) } fn unify<'a>(x: Option>, f: fn(Invariant<'a>)) { let bad = if x.is_some() { x.unwrap() //~ ERROR borrowed data escapes outside of function [E0521] } else { mk_static() }; f(bad); } fn main() {}