Re: [Caml-list] Warning for unused variables

[Aymeric Fromherz <aymeric.fromherz@ens.fr>]

Hi,

Trying with OCaml 4.04 on another machine, I have the same behaviour.
When running the ocaml interpreter with all warnings activated (-w A
option), a warning is raised in the first case, but it is a warning 27
instead of a warning 26.

What is the difference between these two warnings? Could it be that you
have all warnings activated by default?

Thanks,
Aymeric

On 22/02/2017 20:43, Gabriel Scherer wrote:
> This would be a bug, but I cannot reproduce it on my machine, where
> all OCaml versions I have (including 4.02.3) raise a warning as
> expected.
> 
> On Wed, Feb 22, 2017 at 2:21 PM, Aymeric Fromherz
> <aymeric.fromherz@ens.fr> wrote:
>> Hi,
>>
>> Using OCaml 4.02.3, I do not have a warning for unused variables when
>> only one of the variables in a pair is unused.
>> For instance, the code
>>
>> let (a,b) = (0, 42) in b;;
>>
>> raises no warning, while
>>
>> let (a,b) = (0,42) in 1;; raises the following
>>
>> Warning 26: unused variable b.
>> Warning 26: unused variable a.
>>
>> I would have expected a warning in the first case since a is unused.
>>
>> Warnings for single unused variables, such as let a = 42 in 1 are still
>> raised.
>>
>> What is the reason for this? Is this behaviour intended? How are unused
>> variables determined?
>>
>> Thanks in advance,
>> Aymeric Fromherz
>>
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>