I have always used:

  (setq tuareg-in-indent 0)

as described in the custom-tuareg.el file included with tuareg. This does
what you want, but then will do it for all lines after 'in', which maybe you
don't want.

On Thu, Apr 14, 2011 at 6:46 AM, Joel Reymont <joelr1@gmail.com> wrote:

> Is there an update to Tuareg mode for first-class modules?
>
> I would like this
>
>  let open Name in
>      let open Registering in
>
> to be this, for example
>
>  let open Name in
>  let open Registering in
>
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>
>
>
>
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