[swift-evolution] [swift-evolution-announce] [Review] SE-0087: Rename lazy to @lazy

Chris Lattner clattner at apple.com
Wed May 18 00:03:48 CDT 2016

> On May 17, 2016, at 9:14 PM, Brent Royal-Gordon via swift-evolution <swift-evolution at swift.org> wrote:
>> 	https://github.com/apple/swift-evolution/blob/master/proposals/0087-lazy-attribute.md
> The proposal says this at the beginning:
>> Swift's rule for attribues/keywords is that keywords usually modify type of variable; attributes do not.
> [citation needed]
> As far as I can tell, this is not true at all. Most declaration modifiers do *not* change the type of anything; as far as I can tell, only `mutating`, `nonmutating`, and possibly `optional` do. Meanwhile, several attributes—particularly `@noescape` and `@autoclosure`—*do* change the type. So where is this belief coming from?

Correct - the proposal is incorrect in this claim.  Swift's typical policy is that attributes do *not* modify the type of the declaration, which is why Swift 1 and 2 have used “lazy” instead of “@lazy”.


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