CloudKit's database fetchAll methods are missing annotations on Swift 3

Number:rdar://26977470 Date Originated:2016-06-23
Status:Open Resolved:
Product:Developer Tools Product Version:
Classification:Serious Bug Reproducible:Always
Using CloudKit with Swift 3, if you try to fetch all records from the database, using the fetchAll(_:) methods make the compiler choke because they're not correctly type-annotated.

Steps to Reproduce:
1. Instantiate an iCloud Database
2. Try to fetch all Record Zones or Subscriptions from the database using the `fetchAll(_:)` methods.

Expected Results:
The compiler correctly identifies which of the two methods you're using and infers the completionHandler's parameters types.

Actual Results:
The compiler doesn't know which `fetchAll` variant you're using, if either the one that fetches Record Zones or the one that fetches Subscriptions. You can fix it by explicitly declaring the parameters' type yourself:

db.fetchAll { (zones: [CKRecordZone]?, error) in
    // ...

To me, this is a clear example where the API design guidelines are not being respected, favoring brevity over clarity.

Xcode 8 b1


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