Xavier de Gaye wrote:

> When an application forks a Vim that is not compiled with the
> netbeans_intg feature, the application waits for Vim to establish the
> socket connection and Vim silently ignores the "-nb" command line
> argument. It is difficult for the user to understand what is wrong.
> 
> The attached patch causes Vim to exit with an error message when it is
> invoked with "-nb" and not compiled with the netbeans_intg feature.
> This is already what is happening when the diff feature is missing and
> vim is invoked as vimdiff.

The idea looks right: using -nb when it's not supported should make Vim
quit.

The place where you invoke mch_exit() looks a bit weird.  Not sure if
this is the best solution.  And when compiled without GUI (e.g.,
starting a small version of Vim) this exit won't be reached.  Would
someone only use -nb with gvim?

The message should be defined in one place, not twice.

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