message: I have now seen the light of cargo test --doc!
diff: @@ -38,8 +38,9 @@ pub struct Item;
  /// ```
  /// # use wasmer::Memory;
  /// # use wasmer::WasmPtr;
  +/// # use wasmer::ValueType;
  ///
  -/// #[derive(Copy, Clone, Default)]
  +/// #[derive(Copy, Clone, Debug)]
  /// #[repr(C)]
  /// struct V3 {
  /// x: f32,
  