| An intrinsic was declared without being a function. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0622 |
| #![feature(intrinsics)] |
| #![allow(internal_features)] |
| |
| extern "rust-intrinsic" { |
| pub static atomic_singlethreadfence_seqcst: fn(); |
| // error: intrinsic must be a function |
| } |
| |
| fn main() { unsafe { atomic_singlethreadfence_seqcst(); } } |
| ``` |
| |
| An intrinsic is a function available for use in a given programming language |
| whose implementation is handled specially by the compiler. In order to fix this |
| error, just declare a function. Example: |
| |
| ```no_run |
| #![feature(intrinsics)] |
| #![allow(internal_features)] |
| |
| extern "rust-intrinsic" { |
| pub fn atomic_singlethreadfence_seqcst(); // ok! |
| } |
| |
| fn main() { unsafe { atomic_singlethreadfence_seqcst(); } } |
| ``` |
