src/test/ui/issues/issue-25439.rs

   1 struct Helper<'a, F: 'a>(&'a F);
   2
   3 fn fix<F>(f: F) -> i32 where F: Fn(Helper<F>, i32) -> i32 {
   4     f(Helper(&f), 8)
   5 }
   6
   7 fn main() {
   8     fix(|_, x| x); //~ ERROR closure/generator type that references itself [E0644]
   9 }