From: Tiphaine Turpin <Tiphaine.Turpin@irisa.fr>
To: caml-list@yquem.inria.fr
Subject: obscur error message
Date: Tue, 26 Jan 2010 09:06:30 +0100 [thread overview]
Message-ID: <4B5EA286.60603@irisa.fr> (raw)
Hi,
I'm puzzled about the type error returned with the following code (fix :
remove "fs"). Assuming value "mgu" and constructor "Var" are defined, is
it reasonable to report a type error about "subst" rather than the
unbound value "fs" ? I would expect the type-checker to first
successfully type the folded function, (with type (var_name * term) list
-> var_name * term -> (var_name * term) list) and then complain about
unbound value fs.
Tiphaine
let genereal_unify subst eqs =
List.fold_left (fun subst (x, t) -> mgu subst (Var x) t) subst fs eqs
File "prolog.ml", line 475, characters 42-47: (* i.e., second occurrence
of subst *))
Error: This expression has type 'a -> 'b but is here used with type
(var_name * term) list
reply other threads:[~2010-01-26 8:09 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B5EA286.60603@irisa.fr \
--to=tiphaine.turpin@irisa.fr \
--cc=caml-list@yquem.inria.fr \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox