Thanks Patrick.

Ok, this bug is still not working in 5.7.63625. The steps are now:

1. Create and compile a new .NET console application.
 
2. Open APPLICATION in the editor.

3. In the Cluster window, add the System assembly.

4. F7 to compile.
 
5. Edit 'make' thus:
 
   make is
         -- Entry point.
      do
         {REGEX}.
      end

6. After typing the dot wait for autocompletion. It doesn't happen, despite the fact that there are _lots_ of static features on REGEX.

7. Type Ctrl+Space and wait for it. It still doesn't happen.