File to demonstrate very slow compilation times on swift when string concatenation operator used rather than string interpolation.

Foo2.swift

class Foo
{
    let a = "a"
    let b = "b"
    let c = "c"
    
    let values = [ "A", "B", "C", "D", "E" ]
    var rawValues: String
        {
            let a = self.a
            let b = self.b
            let c = self.c
            
            var s : String = "static let \(a) = [ "
#if false
	    /* 
	    real    0m35.143s
	    user    0m29.888s
	    sys     0m0.984s
	    */
            let d : [String] = values.map { $0 + ": " + b + "(" + c + $0 + ")" }
#else
	    /*
	    real    0m0.226s
	    user    0m0.136s
	    sys     0m0.059s
	    */
            let d : [String] = values.map { "\($0): \(b)(\(c)\($0))" }
#endif
            var j = join(", \n", d)
            
            s += j
            s += " ]\n"
            
            return s
    }
}

var f = Foo()
println(f.rawValues)

/*
  Model Name:	MacBook Air
  Model Identifier:	MacBookAir3,1
  Processor Name:	Intel Core 2 Duo
  Processor Speed:	1.4 GHz
  Number of Processors:	1
  Total Number of Cores:	2
  L2 Cache:	3 MB
  Memory:	2 GB
  Bus Speed:	800 MHz
  System Version:	OS X 10.9.4 (13E28)
  Kernel Version:	Darwin 13.3.0
  Boot Volume:	New Macintosh HD
  Boot Mode:	Normal
  Computer Name:	inu
  User Name:	idz (idz)
  Secure Virtual Memory:	Enabled
  Time since boot:	6:21
*/