default(...) is an operator
Chapter 3: Parameterized typing with generics: 3.3.3
Last updated: 2/22/2008
As I point out in the book,
default is never mentioned as an operator in the language specification. That doesn't mean it isn't an operator though. I didn't want to be too specific in the book, but I'm willing to trust Eric's judgement on this: it really is an operator.