From: Jacques Garrigue <garrigue@math.nagoya-u.ac.jp>
To: carette@mcmaster.ca
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Rank-2 polymorphism woes in module signatures
Date: Mon, 19 Feb 2007 09:58:08 +0900 (JST) [thread overview]
Message-ID: <20070219.095808.28398298.garrigue@math.nagoya-u.ac.jp> (raw)
In-Reply-To: <45D8DEB7.3030004@mcmaster.ca>
From: Jacques Carette <carette@mcmaster.ca>
> Those look absolutely identical to me - especially since the definitions
> were done via copy & paste.
> The rank-1 parts of the same record work fine [not shown], but none of
> the rank-2 parts do. The above is a minimal extraction from a real program.
> Can anyone help? [This is in 3.09.01]
Thanks for finding a (very stupid) bug, triggered by your use of a
phantom type. This is now fixed in CVS for 3.10.
Here is a patch that should work on any version of ocaml.
Jacques Garrigue
Index: typing/ctype.ml
===================================================================
RCS file: /net/yquem/devel/caml/repository/csl/typing/ctype.ml,v
retrieving revision 1.204
retrieving revision 1.205
diff -u -r1.204 -r1.205
--- typing/ctype.ml 16 Feb 2007 11:18:36 -0000 1.204
+++ typing/ctype.ml 19 Feb 2007 00:49:16 -0000 1.205
@@ -2264,7 +2264,7 @@
enter_poly env univar_pairs t1 tl1 t2 tl2
(eqtype rename type_pairs subst env)
| (Tunivar, Tunivar) ->
- unify_univar t1 t2 !univar_pairs
+ unify_univar t1' t2' !univar_pairs
| (_, _) ->
raise (Unify [])
end
prev parent reply other threads:[~2007-02-19 0:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-18 23:18 Jacques Carette
2007-02-19 0:58 ` Jacques Garrigue [this message]
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