> On Jun 15, 2017, at 6:01 AM, Chris Lattner via swift-evolution
> <[email protected]> wrote:
>
>
>> On Jun 12, 2017, at 10:07 PM, Paul Cantrell <[email protected]> wrote:
>>
>> What’s the status of this Chris’s double parens idea below? It garnered some
>> positive responses, but the discussion seems to have fizzled out. Is there
>> something needed to help nudge this along?
>>
>> What’s the likelihood of getting this fixed before Swift 4 goes live, and
>> the great wave of readability regressions hits?
>
> We discussed this in the core team meeting today. Consensus seems to be that
> a change needs to be made to regain syntactic convenience here. Discussion
> was leaning towards allowing (at least) the parenthesized form, but more
> discussion is needed.
>
>
> One (tangential) thing that came up is that tuple element names in tuple
> *patterns* should probably be deprecated and removed at some point. Without
> looking, what variables does this declare?:
>
> let (a : Int, b : Float) = foo()
Personally, I use this often as "anonymous structs" (which tuples IMHO are).
Often, there is a return type used in 1-2 methods and in such case, I feel that
declaring a struct MyMethorReturnStruct is unnecessary and I use tuples with
named elements, so that the call site can easily access the information it
needs, which is particularly convenient if both tuple member are of the same
type:
func parseName() -> (firstName: String, lastName: String)
Instead of deprecating this, would it be possible to make this a syntax for
generating a truly anonymous structure? It can internally have a name that
mangles together the element *names and types*, so:
let name = (firstName: "John", lastName: "Doe")
type(of: name) == _firstName_String_lastName_String_
Hence you would be able to pass this structure wherever it's declared exactly
the same, but:
func passName() -> (name1: String, name2: String) {
return parseName() // see above for declaration
}
will result in error as (firstName: String, lastName: String) cannot be
converted to (name1: String, name2: String).
>
> ?
>
> -Chris
>
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