[rustc.git] / compiler / rustc_error_codes / src / error_codes / E0264.md

An unknown external lang item was used.

Erroneous code example:

```compile_fail,E0264
#![feature(lang_items)]

extern "C" {
    #[lang = "cake"] // error: unknown external lang item: `cake`
    fn cake();
}
```

A list of available external lang items is available in
`src/librustc_middle/middle/weak_lang_items.rs`. Example:

```
#![feature(lang_items)]

extern "C" {
    #[lang = "panic_impl"] // ok!
    fn cake();
}
```
Commit	Line	Data
74b04a01 XL	1	An unknown external lang item was used.
	2
	3	Erroneous code example:
60c5eb7d XL	4
	5	```compile_fail,E0264
	6	#![feature(lang_items)]
	7
	8	extern "C" {
	9	#[lang = "cake"] // error: unknown external lang item: `cake`
	10	fn cake();
	11	}
	12	```
	13
	14	A list of available external lang items is available in
ba9703b0	15	`src/librustc_middle/middle/weak_lang_items.rs`. Example:
60c5eb7d XL	16
	17	```
	18	#![feature(lang_items)]
	19
	20	extern "C" {
	21	#[lang = "panic_impl"] // ok!
	22	fn cake();
	23	}
	24	```