Re: [Caml-list] Warning for unused variables

[Gabriel Scherer <gabriel.scherer@gmail.com>]

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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