compiler/rustc_error_codes/src/error_codes/E0451.md

   1 A struct constructor with private fields was invoked.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0451
   6 mod bar {
   7     pub struct Foo {
   8         pub a: isize,
   9         b: isize,
  10     }
  11 }
  12
  13 let f = bar::Foo{ a: 0, b: 0 }; // error: field `b` of struct `bar::Foo`
  14                                 //        is private
  15 ```
  16
  17 To fix this error, please ensure that all the fields of the struct are public,
  18 or implement a function for easy instantiation. Examples:
  19
  20 ```
  21 mod bar {
  22     pub struct Foo {
  23         pub a: isize,
  24         pub b: isize, // we set `b` field public
  25     }
  26 }
  27
  28 let f = bar::Foo{ a: 0, b: 0 }; // ok!
  29 ```
  30
  31 Or:
  32
  33 ```
  34 mod bar {
  35     pub struct Foo {
  36         pub a: isize,
  37         b: isize, // still private
  38     }
  39
  40     impl Foo {
  41         pub fn new() -> Foo { // we create a method to instantiate `Foo`
  42             Foo { a: 0, b: 0 }
  43         }
  44     }
  45 }
  46
  47 let f = bar::Foo::new(); // ok!
  48 ```