bug#13572: 24.3.50; `describe-function' -> "This function has a compiler macro..."

[Jambunathan K <kjambunathan@gmail.com>]

"Drew Adams" <drew.adams@oracle.com> writes:

>> this is a type predicate constructed
>> automatically for a register defstruct.
>> 
>> The doc needs to be improved for this kind of thing 
>> (automatically generated functions).
>
> I guess Common Lisp defstruct does not allow for a doc string for the generated
> predicate (unlike the case for slots, constructor functions, and the defstruct
> itself).
>
> It would be good if Emacs Lisp could automatically generate a minimal doc string
> for the predicate that at least referred to the structure.  Something like this:
>
>  "Type predicate for a NAME structure."
>
> where NAME is the defstruct name.
>
> I guess that would be a wishlist item, since this is not part of the CL spec.
>
> Apart from that, in this particular defstruct it would be good to at least add
> doc strings for those things that allow it.  A doc string for the defstruct
> itself is the least users could ask for.

+1

I ran in to the some confusion while looking at compile.el - constructs
like `compilation--message->loc' which are reported as compiler macros
(Part of the confusion may be because of my ignorance.  Only "macros"
that I know of is `defmacros')

,----
| (cl-defstruct (compilation--message
|             (:constructor nil)
|             (:copier nil)
|             ;; (:type list)                ;Old representation.
|             (:constructor compilation--make-message (loc type end-loc))
|             (:conc-name compilation--message->))
|   loc type end-loc)
`----

Enhanced docstring can educate ignorant people like me...
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