File: test15.0.ott

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% test15.0.ott   is_v test
% single upper/lower type pair, not mutually recursive 

% ISA SUCCEEDS  with no warning

  grammar

    a :: 'a_' ::= 
      | AA         :: :: AA
      | A a          :: :: a

    av :: 'av_' ::= 
      | A a          :: :: a

subrules
  av <:: a