Bug#676858: tuareg-mode: emacs21 require 'derived

[Kevin Ryde <user42@zip.com.au>]

Ralf Treinen <treinen@free.fr> writes:
>
> +(if (and (featurep 'emacs) (= emacs-major-version 21))
> +    (require 'derived))

I think it'd be better to check for the func required, since looking at
version numbers tends to be fragile.

    (unless (fboundp 'derived-mode-p) ;; in derived.el in emacs21
      (require 'derived))

But I'd still suggest an unconditional require.  The use of

    (define-derived-mode tuareg-mode ...

will load derived.el into all emacs versions, so I don't think anything
is saved by conditionalizing it at the start.




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