Can't get String format working in Swift 2 nor Swift 3

bash-3.2$ alias s2
alias s2='sudo xcode-select -s /Applications/Xcode.app ; swift'
bash-3.2$ s2
Password:
Welcome to Apple Swift version 2.2 (swiftlang-703.0.18.8 clang-703.0.30). Type :help for assistance.
1> String(format: "%f %3d", 33, 44)
$R0: String = "(\"%f %3d\", 33, 44)"
2> print(String(format: "%f %3d", 33, 44))
("%f %3d", 33, 44)
3> bash-3.2$

bash-3.2$ alias s3
alias s3='sudo xcode-select -s ~/Applications/Xcode-beta.app ; swift'
bash-3.2$ s3
Welcome to Apple Swift version 3.0 (swiftlang-800.0.30 clang-800.0.24). Type :help for assistance.
1> print(String(format: "%f %3d", 33, 44))
("%f %3d", 33, 44)
2> bash-3.2$

bash-3.2$ cat test.swift ; swift test.swift
print(String(format: "%f %3d", 33, 44))
("%f %3d", 33, 44)
bash-3.2$