If you are unsure how to translate some standard syntax to revised use 
the following tool:

camlp4o pr_r.cmo standard_syntax_file.ml

For the question below add "=" after the opening square bracket:

type a = [= `A ];

Serge

Pietro Abate wrote:
> On Mon, Feb 12, 2007 at 02:32:20PM +1100, Pietro Abate wrote:
>> What is the syntax to use polymorphic variants with camlp4 ?
>> <:str_item< type a = A >> is ok, but <:str_item< type a = [ `A ] >>
>> doesn't work as expected...
> 
> http://caml.inria.fr/mantis/view.php?id=3823
> 
> it seems that searching caml.inria.fr for "polymorphic variants camlp4"
> and selecting the entire web site [1] does not give results from the bug
> tracking system... Searching the site with google [2], return the above link
> as first... It might be a good idea to add the bug tracking system as a
> search option on the inria site.
> 
> [1]
> http://caml.inria.fr//cgi-bin/search.en.cgi?words=polymorphic+variants+camlp4&corpus=all&mode=default&page=1&number=10
> 
> [2]
> http://www.google.com/custom?sa=Google+Search&cof=GALT%3A%23CC6666%3BGL%3A0%3BVLC%3A%236666FF%3BAH%3Acenter%3BBGC%3Awhite%3BLH%3A60%3BLC%3A%236666FF%3BL%3Ahttp%3A%2F%2Frivesaltes.inria.fr%2Fpub%2Flogos%2Fthe-caml-language.468x60.gif%3BALC%3A%236666FF%3BLW%3A468%3BT%3Ablack%3BGIMP%3A%23CC6666%3BAWFID%3Ae31c4f7be5771b9d%3B&domains=caml.inria.fr&sitesearch=caml.inria.fr&q=polymorphic+variants+camlp4
> 
>> When is the new version of camlp4/3.10 due ?
>> (this month, next month, next year) ?
> 
>