tests/ui/closures/issue-82438-mut-without-upvar.rs

   1 use std::error::Error;
   2 struct A {
   3 }
   4
   5 impl A {
   6     pub fn new() -> A {
   7         A {
   8         }
   9     }
  10
  11     pub fn f<'a>(
  12         &'a self,
  13         team_name: &'a str,
  14         c: &'a mut dyn FnMut(String, String, u64, u64)
  15     ) -> Result<(), Box<dyn Error>> {
  16         Ok(())
  17     }
  18 }
  19
  20
  21 fn main() {
  22     let A = A::new();
  23     let participant_name = "A";
  24
  25     let c = |a, b, c, d| {};
  26
  27     A.f(participant_name, &mut c); //~ ERROR cannot borrow
  28 }