Hi,

Daniel de Rauglaudre <daniel.de_rauglaudre@inria.fr> pinpointed the problem:
 > 
 > It was an error that the OCaml version accepted the "??" for the first
 > element.

Thanks!

 > Your code is equivalent to:
 > 
 >   let pc0 c = parser n
 >     [< '  x
 >           when x == c
 >     >] -> ();;

However, there is nothing on
http://caml.inria.fr/camlp4/tutorial/tutorial002.html
that indicates that even this might be legal ---
``when'' is not mentioned on that page.
Would it perhaps make sense to include an adapted version
of the old OCaml Manual section on streams
that tries to give a general description instead of
just a few selected examples?

(Also I have found it useful to leave two blanks after '
 in parsers since in some instances I obtained very strange
 (lexical?) errors.
)


Best regards,

Wolfram Kahl

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