On 08.06.2017 12:17, Víctor Pimentel Rodríguez via swift-evolution wrote:
On Thu, Jun 8, 2017 at 5:15 AM, Susan Cheng via swift-evolution
<swift-evolution@swift.org <mailto:swift-evolution@swift.org>> wrote:
Just a thought
if parentheses is important, why the tuples are not?
This is stated on the proposal (and not in previous proposals):
https://github.com/apple/swift-evolution/blob/master/proposals/0110-distingish-single-tuple-arg.md
*
We understand that this may be a departure from the current convention that
a set
of parentheses enclosing a single object are considered semantically
meaningless,
but it is the most natural way to differentiate between the two situations
described above and would be a clearly-delineated one-time-only exception.
<https://github.com/apple/swift-evolution/blob/master/proposals/0110-distingish-single-tuple-arg.md#impact-on-existing-code>
This proposal marks a one-time-only exception, to differentiate the parenthesis
needed to enclose a list of closure parameters and the parenthesis needed for tuples.
That's adding an exception for implementing a regression.
The more I think about it, the more I hate* this proposal.
* Well, not _hate_, let's say slightly dislike :P
Please look here:
https://github.com/apple/swift-evolution/blob/master/proposals/0066-standardize-function-type-syntax.md
into "Proposed solution" section:
Parentheses will be required in function types. Examples:
Int -> Int // error
(Int) -> Int // function from Int to Int
((Int)) -> Int // also function from Int to Int
Int, Int -> Int // error
(Int, Int) -> Int // function from Int and Int to Int
((Int, Int)) -> Int // function from tuple (Int, Int) to Int
let f: () -> Int // function with no parameters
let g: (()) -> Int // function taking a single () parameter
let h: ((())) -> Int // function taking a single () parameter
f(); g(()); h(()) // correct
f(()); g(); h() // errors
Do you also hate* SE-0066?
--
Víctor Pimentel
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