[swift-evolution] [Pitch] Remove type-inference for stored property

[Sean Heber]

This is not really a helpful comment, but: I kinda wish they did.

l8r
Sean

> On Apr 10, 2017, at 10:54 AM, Daniel Duan via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Neither of these works btw.
> 
> func bar(myString = “hello”)
> class Baz {
>   let myString = { return “hello” }()
> }
> 
>> On Apr 9, 2017, at 11:26 PM, Jean-Daniel <mailing at xenonium.com> wrote:
>> 
>> I’m full -1 on this one. It will make the language inconsistent. How do you explain a new comer that type inference work in some case, but not in other cases, while in both the compiler is completely capable to define the type.
>> 
>> Why 
>> 
>> let myString = "hello" 
>> 
>> would be accepted but not 
>> 
>> class Foo {
>> 	let myString = "hello" 
>> }
>> 
>> 
>> 
>>> Le 10 avr. 2017 à 04:05, Daniel Duan via swift-evolution <swift-evolution at swift.org> a écrit :
>>> 
>>> I’m still not sure whether *I* want this. But here’s a proposal anyways: https://gist.github.com/dduan/5017a0b0f0880d014f4ce14c4ca7fb55
>>> 
>>>> On Apr 7, 2017, at 12:21 AM, Daniel Duan via swift-evolution <swift-evolution at swift.org> wrote:
>>>> 
>>>> Hi all,
>>>> 
>>>> In a discussion about inferring parameter types from default value, Slava brought up some performance problems caused by type inference for stored properties in side types:
>>>> 
>>>> https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170313/033882.html
>>>> 
>>>> Towards the end, the post mentioned that some Swift team members contemplated requiring types for stored properties in type declarations. I think this idea deserves some more attention. Hence this last minute idea-floating.
>>>> 
>>>> In addition to solving a performance headache in implementation, there're always the general benefit of making type declartion more explicit and readable (clarity for reader should out-weigh pleasure of the author). Making the
>>>> language slightly more consistent (we are not inferring types for default parameter values in function anyways).
>>>> 
>>>> The cons for doing this are obvious too: the inference makes the language feels more friendly and is, undoubtedly, a beloved feature for many. This would be a source breaking change.
>>>> 
>>>> Just thought I'd float the idea to gather some quick reaction. What do y'all think?
>>>> 
>>>> Daniel Duan
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>>> 
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