Function lua_sethook 

pub unsafe extern "C-unwind" fn lua_sethook(
    L: *mut lua_State,
    func: Option<unsafe extern "C-unwind" fn(*mut lua_State, *mut lua_Debug)>,
    mask: i32,
    count: i32,
) -> i32

Available on crate feature mlua and (crate features lua51 or luajit) only.