-An unknown external lang item was used. Erroneous code example:
+An unknown external lang item was used.
+
+Erroneous code example:
```compile_fail,E0264
#![feature(lang_items)]
```
A list of available external lang items is available in
-`src/librustc/middle/weak_lang_items.rs`. Example:
+`src/librustc_middle/middle/weak_lang_items.rs`. Example:
```
#![feature(lang_items)]