src/librustc_error_codes/error_codes/E0264.md

   1 An unknown external lang item was used. Erroneous code example:
   2
   3 ```compile_fail,E0264
   4 #![feature(lang_items)]
   5
   6 extern "C" {
   7     #[lang = "cake"] // error: unknown external lang item: `cake`
   8     fn cake();
   9 }
  10 ```
  11
  12 A list of available external lang items is available in
  13 `src/librustc/middle/weak_lang_items.rs`. Example:
  14
  15 ```
  16 #![feature(lang_items)]
  17
  18 extern "C" {
  19     #[lang = "panic_impl"] // ok!
  20     fn cake();
  21 }
  22 ```