src/librustc_error_codes/error_codes/E0422.md

   1 An identifier that is neither defined nor a struct was used.
   2
   3 Erroneous code example:
   4
   5 ```compile_fail,E0422
   6 fn main () {
   7     let x = Foo { x: 1, y: 2 };
   8 }
   9 ```
  10
  11 In this case, `Foo` is undefined, so it inherently isn't anything, and
  12 definitely not a struct.
  13
  14 ```compile_fail
  15 fn main () {
  16     let foo = 1;
  17     let x = foo { x: 1, y: 2 };
  18 }
  19 ```
  20
  21 In this case, `foo` is defined, but is not a struct, so Rust can't use it as
  22 one.