# Error code E0092

An undefined atomic operation function was declared.

Erroneous code example:

    #![allow(unused)]
    #![feature(intrinsics)]

    fn main() {
    extern "rust-intrinsic" {
        fn atomic_foo(); // error: unrecognized atomic operation
                         //        function
    }
    }

Please check you didn't make a mistake in the function's name. All intrinsic functions are defined in `compiler/rustc_codegen_llvm/src/intrinsic.rs` and in `library/core/src/intrinsics.rs` in the Rust source code. Example:

    #![allow(unused)]
    #![feature(intrinsics)]

    fn main() {
    extern "rust-intrinsic" {
        fn atomic_fence_seqcst(); // ok!
    }
    }