Change the very cryptic "don't ask" to something more informative
Change the very cryptic "don't ask" to something more informative

Fixes <rdar://problem/16922703>



Swift SVN r19123

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation