Error code E0044

You cannot use type or const parameters on foreign items.

Example of erroneous code:

#![allow(unused)] fn main() { extern "C" { fn some_func<T>(x: T); } }

To fix this, replace the generic parameter with the specializations that you need:

#![allow(unused)] fn main() { extern "C" { fn some_func_i32(x: i32); } extern "C" { fn some_func_i64(x: i64); } }