c:\kotlin-compiler-1.0.6>kotlinc
Welcome to Kotlin version 1.0.6-release-127 (JRE 1.8.0_31-b13)
Type :help for help, :quit for quit
>>> fun f(s1: String, s2: String, sep: String) = s1 + sep + sep + s2
>>> f("Rosetta", "Code", ":")
Rosetta::Code
>>> :quit