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Every semantic action stretch was already parenthesized by the lexer,
so this led only to redundant parentheses.

  which was always [false].
The field [stretch_raw_content] is still required (for ocamltypes) because
there is one place where we use it (a call to [stretch true] in printer.ml)
and it is NOT identical to [stretch_content] (there is padding and
parentheses). Perhaps one could find a way of removing it. For now
I'll just be dumb and leave it alone.

This reverts commit fc203a594b2d68f40b18966550e9c23460fc20e9.

   If the programmer did not provide a name [_i] is used (where [i] is
   the producer's position in the right hand side).

   This syntax modification actually simplifies the code:
   - There is no more on-the-fly naming of unnamed arguments.
   - Inlining is no more restricted to semantic actions that do not use $i.

   The patch is large because:
   - This change has an impact on many modules.
   - The expected results of the bench had to be updated.

Action: Use [Set.of_list].

for every nonterminal symbol.

This information is displayed at log level -lg 2.
Changed the display to not include the artificial start symbols.

of flat lists.

produce the same result as the old one.

no longer used.

are checked to produce the same results.

users.

place of the old ones (removed).

[Fix], instead of the old ad hoc mechanism. Unfinished.