You tried to declare an undefined atomic operation function. Erroneous code example:
#![feature(intrinsics)] 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 librustc_codegen_llvm/intrinsic.rs and in libcore/intrinsics.rs in the Rust source code. Example:
#![feature(intrinsics)] extern "rust-intrinsic" { fn atomic_fence(); // ok! }