src/test/ui/issues/issue-40000.rs

   1 fn main() {
   2     let bar: fn(&mut u32) = |_| {};
   3
   4     fn foo(x: Box<dyn Fn(&i32)>) {}
   5     let bar = Box::new(|x: &i32| {}) as Box<dyn Fn(_)>;
   6     foo(bar);
   7     //~^ ERROR mismatched types
   8     //~| ERROR mismatched types
   9 }