# Error code E0094

An invalid number of generic parameters was passed to an intrinsic function.

Erroneous code example:

    #![allow(unused)]
    #![feature(intrinsics, rustc_attrs)]
    #![allow(internal_features)]

    fn main() {
    extern "rust-intrinsic" {
        #[rustc_safe_intrinsic]
        fn size_of<T, U>() -> usize; // error: intrinsic has wrong number
                                     //        of type parameters
    }
    }

Please check that you provided the right number of type parameters and verify with the function declaration in the Rust source code. Example:

    #![allow(unused)]
    #![feature(intrinsics, rustc_attrs)]
    #![allow(internal_features)]

    fn main() {
    extern "rust-intrinsic" {
        #[rustc_safe_intrinsic]
        fn size_of<T>() -> usize; // ok!
    }
    }