[SR-2503] subtract
and subtracting
in CharacterSet
are not working
#4329
Labels
subtract
and subtracting
in CharacterSet
are not working
#4329
Environment
Mac OS X El Capitan 10.11.6
Additional Detail from JIRA
md5: ca6970b5e4b7fc3176b709d6d6897fb9
Issue Description:
`CharacterSet` Instance methods `subtract` and `subtracting` are not working.
Here is an example in Swift REPL:
```swift
import Foundation
var charset1 = CharacterSet(charactersIn: "abc")
let charset2 = CharacterSet(charactersIn: "b")
charset1.subtract(charset2)
```
Execution interrupted. Enter code to recover and continue.
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