Open Radar

 
Summary:
In this specific scenario, I type cast a value coming from a dictionary to a string, but the program doesn’t compile and blows up with a swift compile error (segmentation fault 11)

Steps to Reproduce:
1. Write the following code:
=== Begin Code ====
import Foundation

class DateJSONMapper: JSONMapping {
    
    let jsonKey : String
    let objectKey : String
    let dateFormatter : NSDateFormatter
    
    init(jsonKey: String, objectKey: String, dateFormatter: NSDateFormatter) {
        self.jsonKey = jsonKey
        self.objectKey = objectKey
        self.dateFormatter = dateFormatter
    }

    func applyTo(object: NSObject, json: Dictionary<String, AnyObject>) {
        let dateString = json[jsonKey] as String? // <— This is the line that breaks; compiles fine if I use ”\(json[jsonKey])” instead
        let value = dateFormatter.dateFromString(dateString)
        object.setValue(value, forKey: objectKey)
    }
}
=== End Code ===
2. Compile


Expected Results:
I expected it to compile and run the tests for my app against this code.


Actual Results:
The syntax flickers out and I get a “SourceKitService” interrupted and I get an obscure swift compile/parse error as follows:
=== Begin Log ===
1.	While type-checking 'applyTo' at /Users/christiandilorenzo/workspaces/JSONMapper/JSONMapper/DateJSONMapper.swift:32:5
2.	While type-checking declaration at /Users/christiandilorenzo/workspaces/JSONMapper/JSONMapper/DateJSONMapper.swift:33:9
3.	While type-checking expression at [/Users/christiandilorenzo/workspaces/JSONMapper/JSONMapper/DateJSONMapper.swift:33:26 - line:33:49] RangeText="json[jsonKey] as String?"
<unknown>:0: error: unable to execute command: Segmentation fault: 11
<unknown>:0: error: swift frontend command failed due to signal (use -v to see invocation)
=== End Log ===

Version:
iOS 8.0

Notes:


Configuration:
MacBook Pro Retina Display (Using iPhone 4s and 5s simulator per chance)