src/librustc_error_codes/error_codes/E0057.md

   1 An invalid number of arguments was given when calling a closure.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0057
   6 let f = |x| x * 3;
   7 let a = f();        // invalid, too few parameters
   8 let b = f(4);       // this works!
   9 let c = f(2, 3);    // invalid, too many parameters
  10 ```
  11
  12 When invoking closures or other implementations of the function traits `Fn`,
  13 `FnMut` or `FnOnce` using call notation, the number of parameters passed to the
  14 function must match its definition.
  15
  16 A generic function must be treated similarly:
  17
  18 ```
  19 fn foo<F: Fn()>(f: F) {
  20     f(); // this is valid, but f(3) would not work
  21 }
  22 ```