[swift-evolution] When to use argument labels, part DEUX

[Matthew Judge]

Agree that basing the preposition location on whether there is a default value is unfortunate. The problem is "Zone" is not redundant/needless when calling it with the default value.

copyWith()

If I were asking "what zone?" Ok it's the default zone, but I'm just asking "with what?"


> On Feb 7, 2016, at 10:48, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
> on Sat Feb 06 2016, Douglas Gregor <swift-evolution at swift.org> wrote:
> 
>>> On Feb 6, 2016, at 10:08 PM, Dave Abrahams via swift-evolution <swift-evolution at swift.org> wrote:
>>> 
>>> 
>>>> on Sat Feb 06 2016, Thorsten Seitz <swift-evolution at swift.org> wrote:
>>>> 
>>>> So the preposition should move into the argument label if the argument is optional?
>>>> 
>>>> copy(withZone: zone = nil)
>>> 
>>> That's a good idea.
>> 
>> It seems unfortunate that the placement of the preposition should
>> change depending on whether there is a default argument or not,
>> especially since it is reasonable to imagine that an API evolves to
>> gain a default argument later on.
> 
> You're right; it would complicate the rules significantly, too.
> 
>>    - Doug
>> 
>>> 
>>>> -Thorsten 
>>>> 
>>>>> Am 06.02.2016 um 14:45 schrieb Matthew Judge via swift-evolution
>>>>> <swift-evolution at swift.org>:
>>>>> 
>>>>> Very first method
>>>>> 
>>>>> copyWith(zone: Zone = nil)
>>>>> 
>>>>> can be called as
>>>>> 
>>>>> copyWith()
>>>>> 
>>>>> I'm assuming this is still something we don't want right?
>>>>> 
>>>>>> On Feb 6, 2016, at 02:16, Douglas Gregor via swift-evolution
>>>>>> <swift-evolution at swift.org> wrote:
>>>>>> 
>>>>>> 
>>>>>>> On Feb 5, 2016, at 1:32 PM, Dave Abrahams via swift-evolution
>>>>>>> <swift-evolution at swift.org> wrote:
>>>>>>> 
>>>>>>> 
>>>>>>> Given all the awesome feedback I've gotten on this thread, I went back
>>>>>>> to the drawing board and came up with something new; I think this one
>>>>>>> works.  The previously-stated goals still apply:
>>>>>> 
>>>>>>> [snip goals]
>>>>>> 
>>>>>>> P.S. Doug is presently working on generating new importer results, based
>>>>>>>   on these guidelines, for your perusal.  They should be ready soon.
>>>>>> 
>>>>>> 
>>>>>> Here’s a link:
>>>>>> 
>>>>>>    https://github.com/apple/swift-3-api-guidelines-review/pull/10/files
>>>>>> 
>>>>>> Feedback welcome!
>>>>>> 
>>>>>>    - Doug
>>>>>> 
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>>> -- 
>>> -Dave
>>> 
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> 
> -- 
> -Dave
> 
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