bug#12443: 24.2.50; Default values in the minibuffer prompt (fix inconsisntecy)

[Lars Ingebrigtsen]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>>> It seems 'format-prompt' should not use 'minibuffer-default-prompt-format'
>>> when 'default' is nil.
>> nil is a perfectly valid default value in many prompts.
>
> No, `nil` should mean there's no default.
> `"nil"` is a perfectly valid default value, OTOH.

I imagined there was a read-symbol function in use somewhere that used
symbols for completion/defaults, but apparently not -- it's all
completing-read with an intern at the end?

I'll adjust read-prompt to interpret a nil default as "no default".

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no