Open Radar

 
Summary:
I am implementing the Sequence protocol on a class. It works correctly in a Playground file, but fails when added to an iOS project

Steps to Reproduce:
1. Using Xcode 6.0  (6A216f) create a new iOS project.
2. Add Swift file with the following code:

class Matrix: Sequence {
  let cells:Double[][]
  let dimension = 3
  
  init() {
    cells = Double[][]()
    
    // fill with 1's
    for column in 0..dimension {
      cells.append(Array(count: dimension, repeatedValue: 1.0))
    }
  }
  
  typealias GeneratorType = CellSequenceGenerator
  
  func generate() -> CellSequenceGenerator {
    return CellSequenceGenerator(matrix: self)
  }
  
  class CellSequenceGenerator : Generator {
    let matrix: Matrix
    var row = 0, column = 0
    
    init (matrix: Matrix) {
      self.matrix = matrix
    }
    
    typealias Element = Double
    
    func next() -> Double? {
      let nextValue = matrix.cells[row][column]
      row++
      if row >= matrix.dimension {
        row = 0
        column++
      }
      return column < 3 ? nextValue : nil;
    }
  }
}

3. Compile and run

Expected Results:
The app should compile

Actual Results:
Compiler fails reporting the following:

Command /Applications/Xcode6-Beta2.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 254