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Date: Wed, 18 Feb 2015 09:07:54 +0100
From: Maxence Guesdon <Maxence.Guesdon@inria.fr>
To: caml-list@inria.fr
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Subject: [Caml-list] Camlp4 and [@@ attributes

Hello,

On the following example (in p4.ml):

  type t = Foo [@@attribute blabla]

the following command fails due to camlp4 not handling [@@ attributes:

$ ocamlfind ocamlc -package js_of_ocaml.syntax -syntax camlp4o p4.ml
File "p4.ml", line 1, characters 9-12:
Parse error: [semi] expected after [str_item] (in [implem])
File "p4.ml", line 1:
Error: Error while running external preprocessor
Command line: camlp4 '-I' '/home/guesdon/.opam/4.02.1/lib/ocaml/camlp4'
'-I' '/home/guesdon/.opam/4.02.1/lib/js_of_ocaml' '-parser' 'o'
'-parser' 'op' '-printer' 'p' 'pa_js.cmo'  'p4.ml' > /tmp/ocamlpp1dd80a

Is there a special invocation of camlp4 to make it accept the [@@
syntax ?

Maxence