Swift 4.1.2 Autocomplete: Suggesting extensions on Array that it shouldn't

Question

Maybe I'm going crazy here, but extension Array where Element == String in Swift 4.1.2 is exposing its properties in Swift's autocomplete on types when it should not be there.

For example, this extension:

extension Array where Element == String {
    public var test: [String] {
        return ["test"]
    }
}

Then start typing:

[123].te ...

and Swift suggests that the test property is also available on [Int] which is impossible. Then the syntax checker pops up the error:

Type of expression is ambiguous without more context

Is there something I'm missing? Perhaps some other/additional conformance restrictions that need to be used? Or is this a Swift bug?

you can fix it extending the Collection instead of Array. `extension Collection where Element == String {` — Leo Dabus, Jun 24 '18 at 10:44
This guy here says that `Element` can only be restricted by a protocol in an `Array` extension: https://stackoverflow.com/questions/30746190/swift-where-array-extensions#comment68188685_30746254 — Mihai Fratu, Jun 26 '18 at 21:56
Note: in the bounty message I meant "link to a bug report ***if*** this is a bug." — Sweeper, Jun 27 '18 at 07:14

score 2 · Accepted Answer · answered Jun 28 '18 at 23:31

2

It appears to be a bug.

This Swift.org bug report demonstrates the same behavior:

https://bugs.swift.org/browse/SR-5388

answered Jun 28 '18 at 23:31

stef

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Swift 4.1.2 Autocomplete: Suggesting extensions on Array that it shouldn't

1 Answers1