Error code E0622

An intrinsic was declared without being a function.

Erroneous code example:

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

extern "rust-intrinsic" {
    pub static breakpoint: fn(); // error: intrinsic must be a function
}

fn main() { unsafe { breakpoint(); } }

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:

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

extern "rust-intrinsic" {
    pub fn breakpoint(); // ok!
}

fn main() { unsafe { breakpoint(); } }