message: feat(c-api) Support null pointers in `wasm_func_new_with_env`.
diff: @@ -87,13 +87,17 @@ pub unsafe extern "C" fn wasm_func_new(
  #[no_mangle]
  pub unsafe extern "C" fn wasm_func_new_with_env(
  - store: &wasm_store_t,
  - function_type: &wasm_functype_t,
  - callback: wasm_func_callback_with_env_t,
  + store: Option<&wasm_store_t>,
  + function_type: Option<&wasm_functype_t>,
  + callback: Option<wasm_func_callback_with_env_t>,
  env: *mut c_void,
  - finalizer: wasm_env_finalizer_t,
  + finalizer: Option<wasm_env_finalizer_t>,
  ) -> Option<Box<wasm_func_t>> {
  - // TODO: handle null pointers?
  + let store = store?;
  + let function_type = function_type?;
  + let callback = callback?;
  + let finalizer = finalizer?;
  +
  let func_sig = &function_type.inner().function_type;
  let num_rets = func_sig.results().len();
  let inner_callback =
  