This DEV-only field was added in 836331ba5f69f2cc53b273ec073fae116db14302 by @sebmarkbage but it's not being used anymore to my knowledge.
workInProgress.type = Component = resolveForwardRefForHotReloading(
          Component,
        );
      }
      child = updateForwardRef(
        null,
        workInProgress,
        Component,
        resolvedProps,
        renderLanes,
      );
      return child;
    }
    case MemoComponent: {
      if (__DEV__) {
        if (workInProgress.type !== workInProgress.elementType) {
          const outerPropTypes = Component.propTypes;
          if (outerPropTypes) {
            checkPropTypes(
              outerPropTypes,
              resolvedProps, 
              'prop',
              getComponentNameFromType(Component),
            );
          }
        }
      }
      child = updateMemoComponent(
        null,
        workInProgress,