Once 3.0-dev picked 2.1.1 is never shown as the active build again

[jlyonsmith]

$echo $SWIFTS
/Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-02-08-a.xctoolchain/usr/bin
$chswift
 * 2.1.1 (swiftlang-700.1.101.15 clang-700.1.81)
   3.0-dev (LLVM a7663bb722, Clang 4ca3c7fa28, Swift 1c2f40e246)
$chswift 3.0
$chswift
 * 3.0-dev (LLVM a7663bb722, Clang 4ca3c7fa28, Swift 1c2f40e246)
   2.1.1 (swiftlang-700.1.101.15 clang-700.1.81)
$chswift 2.1.1
$chswift
 * 3.0-dev (LLVM a7663bb722, Clang 4ca3c7fa28, Swift 1c2f40e246)
   2.1.1 (swiftlang-700.1.101.15 clang-700.1.81)

However, it does appear that the correct Swift version is active based on swift -v