Dear Maintainer,

   * What led up to the situation?

While performing some tests using modules I first defined a module defining a
class type. Its compilation completed flawlessly. Next I defined a module
partition defining a class type. It's compilation failed.

   * What exactly did you do (or not do) that was effective (or
     ineffective)?

First the module that was successfully compiled:

    I defined the following module interface (in, e.g., 'module.cc'):