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Error code E0093

An unknown intrinsic function was declared.

Erroneous code example:

#![feature(intrinsics)] #![allow(internal_features)] #[rustc_intrinsic] unsafe fn foo(); // error: unrecognized intrinsic function: `foo` fn main() { unsafe { foo(); } }

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