File: test15.2.ott

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% test15.2.ott   is_v test
% mutual recursion between a single upper/lower type pair

% ISA FAILS: isa doesn't seem to like multiple mutually recursive primrecs over the same type

  grammar

    a :: 'a_' ::= 
      | AA         :: :: AA
      | A a          :: :: a
      | C av       :: :: C
      | CC av      :: :: CC

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

subrules
  av <:: a