An undefined atomic operation function was declared.
Erroneous code example:
#![feature(intrinsics)] #![allow(internal_features)] 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:
#![feature(intrinsics)] #![allow(internal_features)] extern "rust-intrinsic" { fn atomic_fence_seqcst(); // ok! }