## Keyboard shortcuts

Press `←` or `→` to navigate between chapters

Press `S` or `/` to search in the book

Press `?` to show this help

Press `Esc` to hide this help

# Error code E0094

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

Erroneous code example:

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

    fn main() {
    #[rustc_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)]
    #![allow(internal_features)]

    fn main() {
    #[rustc_intrinsic]
    fn size_of<T>() -> usize; // ok!
    }