I'm in favour of deprecating `::` for method calls as well. I'm all for
"multiple roads to Rome" but when it comes to the method calling syntax
I really want it to be consistent.

Actually getting rid of the operator is going to be interesting though
since I believe it's used in various places of MRI's core/std library as
well as third-party projects. This is probably something that shouldn't
be removed until at least 2.2.

Yorick