More about parsing

Consider the development about parsing well parenthetized strings (see here). Build a function with the following specification:
Definition parse_nest :
 forall l: list par,
  {l'':list par &
   {t:bin | parse_rel l l'' t}}+{forall l'' t', ~parse_rel l l'' t'}.


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Yves Bertot
Last modified: Tue May 20 15:26:16 MEST 2003