compiler/rustc_error_codes/src/error_codes/E0593.md

   1 You tried to supply an `Fn`-based type with an incorrect number of arguments
   2 than what was expected.
   3
   4 Erroneous code example:
   5
   6 ```compile_fail,E0593
   7 fn foo<F: Fn()>(x: F) { }
   8
   9 fn main() {
  10     // [E0593] closure takes 1 argument but 0 arguments are required
  11     foo(|y| { });
  12 }
  13 ```
  14
  15 You have to provide the same number of arguments as expected by the `Fn`-based
  16 type. So to fix the previous example, we need to remove the `y` argument:
  17
  18 ```
  19 fn foo<F: Fn()>(x: F) { }
  20
  21 fn main() {
  22     foo(|| { }); // ok!
  23 }
  24 ```