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

[Lucas Neiva]

(Forgot CC. How's that Discord coming along? 😜)

> On 7 Apr 2017, at 13:07, Lucas Neiva <lneiva at me.com> wrote:
> 
> +1
> 
> I think declaring property types is beneficial to readability.
> 
> It seems to me like properties are on the same level as functions, where types are also not inferred. I see them both as “members”, if you like.
> 
> Another thing is that computed properties also require an explicit type, which sometimes trips me up a bit when mixing computed and normal properties.
> 
>> On Apr 07, 2017, at 09:21 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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