src/test/ui/regions/region-invariant-static-error-reporting.rs

   1 // This test checks that the error messages you get for this example
   2 // at least mention `'a` and `'static`. The precise messages can drift
   3 // over time, but this test used to exhibit some pretty bogus messages
   4 // that were not remotely helpful.
   5
   6 // error-pattern:argument requires that `'a` must outlive `'static`
   7
   8 struct Invariant<'a>(Option<&'a mut &'a mut ()>);
   9
  10 fn mk_static() -> Invariant<'static> { Invariant(None) }
  11
  12 fn unify<'a>(x: Option<Invariant<'a>>, f: fn(Invariant<'a>)) {
  13     let bad = if x.is_some() {
  14         x.unwrap() //~ ERROR borrowed data escapes outside of function [E0521]
  15     } else {
  16         mk_static()
  17     };
  18     f(bad);
  19 }
  20
  21 fn main() {}