Re: How to quote a list of functions?

["Pascal J. Bourguignon" <pjb@informatimago.com>]

Emanuel Berg <embe8573@student.uu.se> writes:

> Barry Margolin <barmar@alum.mit.edu> writes:
>
>>> And those are, besides checking if there is such
>>> a function?
>>
>> Currently that's it, I think. I was just describing
>> it in a more generic way.
>
> OK. So it should look like this:
>
> (put #'upcase-region    'disabled   nil)
> (put #'downcase-region  'disabled   nil)
> (put #'erase-buffer     'disabled   nil)
> (put #'suspend-frame    'disabled   t  )

Definitely not.

The notion of type should still exist in the mind of the programmer, if
not in the compiler!

The first parameter of put is of type symbol
(function x) returns an object of type function.
While it's true that in emacs lisp, symbol is a subtype of function,
the reverse is not true.  Some functions are not symbols.
Therefore, the Lyskoff Substitution Principle tells us that 

   (put #'upcase-region    'disabled   nil)

is a gross error.  It should be:

   (put 'upcase-region    'disabled   nil)

-- 
__Pascal Bourguignon__                 http://www.informatimago.com/
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