[Caml-list] How to use ocaml.warning

[Ian Zimmerman <itz@very.loosely.org>]

Hello, I wonder how to use the ocaml.warning attribute described here:

https://caml.inria.fr/pub/docs/manual-ocaml-4.08/manual035.html#sec265

To describe my situation, I had a list l of int pairs which I could prove
non-empty and I wanted to extract the first two ints.  I wrote

  let (i, j) :: rest = l in ...

and of course I got warning 8.  So I got interested in ways to suppress
the warning, and I read about the attributes which are new to me and
made me curious :P  I tried to insert

  [@ocaml.warning "-8"]

at many points in the code -- before the "let", before and after the
equal sign, and before "in" -- but none of these ways got rid of the
warning.  I gave up and used List.hd.  But I am still curious about the
intended or correct usage of the attribute feature.

Thanks.

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