testing 7.02-candidate

[Serge D. Mechveliani]

This is to add to my last letter.
It is curious that this 7.02 candidate stucks at  оverlapping instances  
only when compiling the test:
  T_cubeext.hs:143:9:
    Overlapping instances for LinSolvRing (UPol k)
      arising from a use of `ct'
  ...
In earlier versions, if any of them stuck at оverlapping instances, 
the report was earlier, when compiling the DoCon library.

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Mechveliani