* Typing of the sequence operator (;)
@ 2005-11-11 19:33 Lukasz Stafiniak
2005-11-11 20:12 ` [Caml-list] " Martin Jambon
2005-11-12 4:11 ` skaller
0 siblings, 2 replies; 3+ messages in thread
From: Lukasz Stafiniak @ 2005-11-11 19:33 UTC (permalink / raw)
To: caml users
Dear list,
Why does the sequence operator (;) have type 'a -> 'b -> 'b and not
unit -> 'a -> 'a? There is (ignore) for doing "these things"
purposefully. The toplevel warning is very often mute. Together with
labels, this is a source of bugs.
Best Regards,
Lukasz
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Caml-list] Typing of the sequence operator (;)
2005-11-11 19:33 Typing of the sequence operator (;) Lukasz Stafiniak
@ 2005-11-11 20:12 ` Martin Jambon
2005-11-12 4:11 ` skaller
1 sibling, 0 replies; 3+ messages in thread
From: Martin Jambon @ 2005-11-11 20:12 UTC (permalink / raw)
To: Lukasz Stafiniak; +Cc: caml users
On Fri, 11 Nov 2005, Lukasz Stafiniak wrote:
> Dear list,
>
> Why does the sequence operator (;) have type 'a -> 'b -> 'b and not
> unit -> 'a -> 'a? There is (ignore) for doing "these things"
> purposefully. The toplevel warning is very often mute. Together with
> labels, this is a source of bugs.
You can use the Camlp4 pa_ru.cmo module which adds type constraints in
sequences, and is mentioned there:
http://caml.inria.fr/pub/docs/manual-camlp4/manual002.html
So something like that should work:
ocamlopt -pp 'camlp4o pa_ru.cmo' yourfile.ml
Martin
--
Martin Jambon, PhD - http://martin.jambon.free.fr
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Caml-list] Typing of the sequence operator (;)
2005-11-11 19:33 Typing of the sequence operator (;) Lukasz Stafiniak
2005-11-11 20:12 ` [Caml-list] " Martin Jambon
@ 2005-11-12 4:11 ` skaller
1 sibling, 0 replies; 3+ messages in thread
From: skaller @ 2005-11-12 4:11 UTC (permalink / raw)
To: Lukasz Stafiniak; +Cc: caml users
On Fri, 2005-11-11 at 20:33 +0100, Lukasz Stafiniak wrote:
> Dear list,
>
> Why does the sequence operator (;) have type 'a -> 'b -> 'b and not
> unit -> 'a -> 'a? There is (ignore) for doing "these things"
> purposefully. The toplevel warning is very often mute. Together with
> labels, this is a source of bugs.
Yes, I actually think this should be made a hard error.
In transition, a compiler flag to let it pass.
The only place I can see where you might want to 'drop'
a returned value is when interfacing the external world.
--
John Skaller <skaller at users dot sf dot net>
Felix, successor to C++: http://felix.sf.net
^ permalink raw reply [flat|nested] 3+ messages in thread
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