rust/src/librustc_error_codes/error_codes/E0044.md

You cannot use type or const parameters on foreign items.

Example of erroneous code:

extern { fn some_func<T>(x: T); }

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

extern { fn some_func_i32(x: i32); }
extern { fn some_func_i64(x: i64); }