[swift-evolution] [Pitch] Allow numerical keywords in member references

Adrian Zubarev adrian.zubarev at devandartist.com
Thu Mar 9 01:33:30 CST 2017

I forget to mention, this should be also valid:

let `42` = 42


struct A {
    let `0` = 0

let number = A().0

Adrian Zubarev
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Am 9. März 2017 um 08:24:54, Adrian Zubarev (adrian.zubarev at devandartist.com) schrieb:

Hi Swift community, I’d like to pitch this idea again.

Swift already has the pitched feature, but it is exclusive for tuples only. SE–0071 allowed the use of keywords after the . in a member access, except for those keywords that have special meaning by using back-ticks. However, members starting with numbers are not special keywords and as already mentioned, numerical members are already allowed in tuples.

I propose to extend that capability to the whole language and make that behavior consistent. To disambiguate members starting with a number one would need to use back-ticks.

// Enum
enum ErrorCode : String {
    case `2345` = "my description for 2345"
    case `123a` = "my description for 123a"
    case `123b` = "my description for 123b"

let code = ErrorCode.2345

// Function
func `42foo`(label: Type, `12345`: Type, `0987something`: Type) { … }

// Tuple
(`1`: Int, `2`: Int)
My question is: would that be in scope for Swift 4?

Adrian Zubarev
Sent with Airmail
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