File: test15.3.ott

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% test15.3.ott  is_v test
% mutual recursion between a pair of upper/lower type pairs

% ISA FAILS

  grammar

    a :: 'a_' ::= 
      | AA         :: :: AA
      | A a          :: :: a
      | B b          :: :: b
      | C av bv    :: :: C
      | D av bv    :: :: D

    b :: 'b_' ::= 
      | BB         :: :: BB
      | A a          :: :: a
      | B b          :: :: b

    av :: 'av_' ::= 
      | A a          :: :: a
      | B b          :: :: b
      | C av bv    :: :: C

    bv :: 'bv_' ::= 
      | A a          :: :: a
      | B b          :: :: b

subrules
  av <:: a
  bv <:: b