pub type duk_safe_call_function = Option<unsafe extern "C" fn(ctx: *mut duk_context, udata: *mut c_void) -> duk_ret_t>;
pub enum duk_safe_call_function { None, Some(unsafe extern "C" fn(*mut duk_hthread, *mut c_void) -> i32), }
No value.
Some value of type T.
T