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In Scala (2.7.7final), the Predef.println method is defined as having the following signature:
def println (x : Any) : Unit
How come, then that the following works:
scala> println(1,2)
(1,2)
Does the compiler automatically convert a comma-separated list of arguments into a Tuple? By what magic? Is there an implicit conversion going on here, and if so, which one?
Yes, the compiler will attempt to convert comma separated arguments into tuples, if there are no appropriate multi-argument methods and a single appropriate one-argument method. It’s not an implicit conversion, just a compiler hack. This is a somewhat controversial feature, and will probably undergo changes going forward, as work is planned around unifying the treatment of tuples and argument lists.