| Invalid ABI (Application Binary Interface) used in the code. | |
| Erroneous code example: | |
| ```compile_fail,E0703 | |
| extern "invalid" fn foo() {} // error! | |
| # fn main() {} | |
| ``` | |
| At present few predefined ABI's (like Rust, C, system, etc.) can be | |
| used in Rust. Verify that the ABI is predefined. For example you can | |
| replace the given ABI from 'Rust'. | |
| ``` | |
| extern "Rust" fn foo() {} // ok! | |
| # fn main() { } | |
| ``` |