Function wasmtime_func_call_async 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn wasmtime_func_call_async<'a>(
    store: WasmtimeStoreContextMut<'a>,
    func: &'a Func,
    args: *const wasmtime_val_t,
    nargs: usize,
    results: *mut MaybeUninit<wasmtime_val_t>,
    nresults: usize,
    trap_ret: &'a mut *mut wasm_trap_t,
    err_ret: &'a mut *mut wasmtime_error_t,
) -> Box<wasmtime_call_future_t<'a>>