[sv-ec] Prohibit overriding data members of a class?

hi EC,

I recently had a query from a student who had tried to 
override a *data* member of a class...

  class C;
    int N = 3;
    function int get_N(); return N; endfunction
  endclass
  class D extends C;
    int N = 4;
    function int get_N(); return N; endfunction
  endclass
  ...
  ...
  D d = new;
  C c = new;
  $display(c.get_N()); // "3" as expected
  $display(d.get_N()); // "3" seen ???!!!

(By the way, I don't even know which simulator this person
was using.)

It seems to me that this should be illegal, and you should
be able to override only methods, not data members.  Although
the LRM hints as much, I can't find an explicit prohibition
of overriding a data member, nor a description of what to do
should it occur.

Any other opinions?  Is this just a compiler failing to
report an error, or have I missed something?  Do we need
some minor LRM clarification for this?
-- 
Jonathan Bromley, Consultant

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